Transcription

Application NoteFusion Connect SIP Trunking:Cisco Unified Communications Manager 11.5.1 withCisco Unified Border Element (CUBE 11.5.2) onISR4321 [IOS-XE 16.3.1] using SIPOctober 2016 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 1 of 51

Table of ContentsIntroduction . 4Network Topology . 5System Components . 6Hardware Requirements . 6Software Requirements . 6Features . 7Features Supported . 7Features Not Supported . 7Caveats . 7Configuration . 8Configuring the Cisco Unified Border Element for Registration SIP Trunk Testing . 8Network interface . 8Global Cisco UBE settings . 9Codecs . 10Dial peer . 10Configuration example . 13Call flow . 31Configuring Cisco Unified Communications Manager . 33Cisco UCM Version . 33Cisco Call Manager Service Parameters . 33Offnet Calls via Fusion Connect SIP Trunk . 35Dial Plan . 43Acronyms . 49Important Information . 50 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 2 of 51

Table of FiguresFigure 1: Network Topology . 5Figure 2: Cisco UBE High Availability . 5Figure 3: Outbound Voice Call. 31Figure 4: Outbound Fax Call . 31Figure 5: Inbound Voice Call . 32Figure 6 : Inbound Fax Call . 32Figure 7 : PBX to PBX via Fusion Connect Call . 32Figure 8: Cisco UCM Version . 33Figure 9: Service Parameters . 33Figure 10: Service Parameters (Cont.). 34Figure 11: SIP Trunk Security Profile . 35Figure 12: SIP Profile . 36Figure 13: SIP Profile (Cont.) . 37Figure 14: SIP Profile (Cont.) . 38Figure 15: SIP Trunks List . 39Figure 16: SIP Trunk to Cisco UBE . 40Figure 17: SIP Trunk to Cisco UBE (Cont.) . 41Figure 18: SIP Trunk to Cisco UBE (Cont.) . 42Figure 19: Route Patterns List . 44Figure 20: Route Pattern for Voice . 45Figure 21: Route Pattern for Voice (Cont.) . 46Figure 22: Route Pattern for Fax . 47 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 3 of 51

IntroductionService Providers today, such as Fusion Connect, are offering alternative methods to connect to the PSTN via their IPnetwork. Most of these services utilize SIP as the primary signaling method and centralized IP to TDM POP gatewaysto provide on-net and off-net services.Fusion Connect is a service provider offering that allows connection to the PSTN and may offer the end customer aviable alternative to traditional PSTN connectivity. A demarcation device between these services and customer ownedservices is recommended. As an intermediary device between Cisco Unified Communications Manager and FusionConnect network, Cisco Unified Border Element (CUBE 11.5.2) ISR 4321/K9 running IOS-XE 16.3.1 can be used.The Cisco Unified Border Element provides demarcation, security, interworking and session control services for CiscoUnified Communications Manager 11.5.1 connected to Fusion Connect IP network.This document assumes the reader is knowledgeable with the terminology and configuration of Cisco UnifiedCommunications Manager. Only configuration settings specifically required for Fusion Connect interoperability arepresented. Feature configuration and most importantly the dial plan are customer specific and need individualapproach. This application note describes how to configure Cisco Unified Communications Manager (Cisco UCM)11.5.1, and Cisco Unified Border Element (Cisco UBE) on ISR 4321/K9 [IOS-XE 16.3.1] for connectivity toFusion Connect SIP Trunking service. The deployment model covered in this application note is CPE (CiscoUnified Communications Manager 11.5.1 to PSTN (Fusion Connect). Testing was performed in accordance to Fusion Connect generic SIP Trunking test methodology and amongfeatures verified were – basic calls, DTMF transport, Music on Hold (MOH), unattended and attendedtransfers, call forward, conferences and interoperability with Cisco Unity Connection (CUC). The Cisco UCM configuration detailed in this document is based on a lab environment with a simple dial-planused to ensure proper interoperability between Fusion Connect SIP network and Cisco UnifiedCommunications. The configuration described in this document details the important configuration settings tohave enabled for interoperability to be successful and care must be taken by the network administratordeploying Cisco UCM to interoperate to Fusion Connect SIP Trunking network.This application note does not cover the use of Calling Search Spaces (CSS) or partitions on Cisco UCM. Tounderstand and learn how to apply CSS and partitions refer to the cisco.com link below:http://www.cisco.com/c/en/us/td/docs/voice ip comm/cucm/srnd/collab10/collab10/dialplan.html 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 4 of 51

Network TopologyFigure 1: Network TopologyFigure 2: Cisco UBE High Availability 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 5 of 51

System ComponentsHardware Requirements Cisco UCS-C240-M3S VMWare host running ESXi 5.5 StandardCisco ISR 4321/K9 router as CUBECisco ISR 4321/K9 (1RU) processor with 1652953K/6147K bytes of memory with 3 Gigabit Ethernet interfacesProcessor board ID FLM1925W0X0Cisco 2901 Fax GatewayIP phones 7970 (SIP), 7942 (SCCP)Software Requirements Cisco Unified Communications Manager 11.5.1.10000-6Cisco Unity Connection 11.5.1.10000-6IOS-XE 16.3.1 for ISR 4321/K9 Cisco Unified Border Element [CUBE 11.5.2]Cisco IOS Software, ISR Software (X86 64 LINUX IOSD-UNIVERSALK9-M), Version 16.3.1, RELEASESOFTWARE (fc3)Cisco IOS XE Software, Version 16.3.1IOS 15.4 XA for Cisco 2901 Fax Gateway 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 6 of 51

FeaturesFeatures Supported Incoming and outgoing off-net calls using G711ULAW & G729 voice codecsCall holdCall Transfer (unattended and attended)Call ConferenceCall forward (all, busy, no answer)Calling Line (number) Identification Presentation (CLIP)DTMF relay (both directions) (RFC2833)Media flow-through on Cisco UBEFax (T38 & G711 pass-through)Features Not Supported 0 and 0 10 digit dial plan - Operator assisted calls are not supported by Fusion Connect at the moment Privacy ID feature is not supported by Fusion Connect Rel100 feature is not supported by Fusion ConnectCaveats In HA Redundancy mode the Primary CUBE will not take over the Primary/Active role after a reboot/networkoutageCaller ID is not updated after attended or semi-attended transfers to off-net phones. This is due to a limitationon Cisco UBE and will be resolved in the next release. The issue does not impact the calls.Fusion Connect supports Faxing up to G3/V.17 with T.38 Version 0. However, Fusion supports faxing withSuperG3/V.34 over G711.Early media calls that requires PRACK with SDP failed with enabling “require100rel” since Fusion Connectdoes not support “require100rel”. However, the call was successful without PRACK.Fusion Connect does not support “Privacy id”. But Fusion Connect can support Privacy ID as per customerrequest.Fusion Connect has its own Music on Hold features and if the customer would like to use the PBX hold music,Fusion will support the Hold INVITE utilizing “a sendreceive” instead of “a sendonly”Fusion Connect requires 10 digit BTN number in From header to process the basic Outbound callssuccessfully 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 7 of 51

ConfigurationConfiguring the Cisco Unified Border Element for Registration SIP Trunk TestingNetwork interfaceConfigure Ethernet IP address and sub interface. The IP address and VLAN encapsulation used are for illustrationonly, the actual IP address can vary. For SIP trunks two IP addresses must be configured—LAN and WAN.interface GigabitEthernet0/0/0description FusionConnect LANip address 10.80.13.10 255.255.255.0media-type rj45negotiation autoredundancy rii 8redundancy group 1 ip 10.80.13.20 exclusive!interface GigabitEthernet0/0/1description FusionConnect WANip address 1XX.XX.XX.XX 255.255.255.128negotiation autoredundancy rii 9redundancy group 1 ip 1XX.XX.XX.XX exclusive! 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 8 of 51

Global Cisco UBE settingsIn order to enable Cisco UBE IP2IP gateway functionality, enter the following:voice service voipip address trusted listipv4 2XX.XX.XX.XXipv4 2XX.XX.XX.XXaddress-hidingmode border-element license capacity 20allow-connections sip to sipredundancy-group 1fax protocol pass-through g711ulawsipbind control source-interface GigabitEthernet0/0/1rel1xx supported "rel100"session refreshasserted-id paiprivacy pstnearly-offer forcedmidcall-signaling passthrug729 ections sip to sipAllow IP2IP connections between two SIP call legsasserted-idSpecifies the type of privacy header in the outgoing SIP requests andresponse messagesearly-offer forcedEnables SIP Delayed-Offer to Early-Offer globallymidcall-signaling passthruPasses SIP messages from one IP leg to another IP leg 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 9 of 51

CodecsG711ulaw and G729 voice codecs are used for this testing. Codec preferences used to change according to the testplan descriptionvoice class codec 1codec preference 1 g711ulawcodec preference 2 g729r8codec preference 3 g722-56Dial peerCisco UBE uses dial-peer to route the call based on the digit to route the call accordingly.dial-peer voice 500 voipdescription Outgoing Call from PBX to PSTN-LAN facinghuntstopsession protocol sipv2session target sip-serversession transport udpincoming called-number [0-9]Tvoice-class codec 1voice-class sip asserted-id paivoice-class sip options-keepalivevoice-class sip bind control source-interface GigabitEthernet0/0/0voice-class sip bind media source-interface GigabitEthernet0/0/0dtmf-relay rtp-ntefax-relay ecm disablefax rate disablefax nsf 000000fax protocol pass-through g711ulawno vad!dial-peer voice 510 voip 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 10 of 51

description Outgoing Call from PBX to PSTN-WAN facinghuntstopdestination-pattern [0-9]Tsession protocol sipv2session target sip-serversession transport udpvoice-class codec 1voice-class sip asserted-id paivoice-class sip profiles 101voice-class sip options-keepalivevoice-class sip bind control source-interface GigabitEthernet0/0/1voice-class sip bind media source-interface GigabitEthernet0/0/1dtmf-relay rtp-ntefax-relay ecm disablefax rate disablefax nsf 000000fax protocol pass-through g711ulawno vad!dial-peer voice 520 voipdescription Incoming Call to PBX from PSTN-WAN facinghuntstopsession protocol sipv2session target sip-serversession transport udpincoming called-number XXXXXX.voice-class codec 1voice-class sip asserted-id paivoice-class sip options-keepalivevoice-class sip bind control source-interface GigabitEthernet0/0/1 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 11 of 51

voice-class sip bind media source-interface GigabitEthernet0/0/1dtmf-relay rtp-ntefax-relay ecm disablefax rate disablefax nsf 000000fax protocol pass-through g711ulawno vad!dial-peer voice 530 voipdescription Incoming Call to PBX from PSTN-LAN facinghuntstopdestination-pattern XXXXXX.session protocol sipv2session target ipv4:10.80.23.3:5060session transport udpvoice-class codec 1voice-class sip asserted-id paino voice-class sip outbound-proxyvoice-class sip options-keepalivevoice-class sip bind control source-interface GigabitEthernet0/0/0voice-class sip bind media source-interface GigabitEthernet0/0/0dtmf-relay rtp-ntefax-relay ecm disablefax rate disablefax nsf 000000fax protocol pass-through g711ulawno vad! 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 12 of 51

Configuration exampleThe following contains a sample configuration of Cisco Unified Border Element with all parameters mentionedpreviously.Active Cisco UBEfusionConnect1#sh run!version 16.3service timestamps debug datetime msecservice timestamps log datetime msecservice internalservice sequence-numbersno platform punt-keepalive disable-kernel-core!hostname fusionConnect1!boot-start-markerboot system flash -end-marker!vrf definition Mgmt-intf!address-family ipv4exit-address-family!address-family ipv6exit-address-family!logging queue-limit 10000 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 13 of 51

logging buffered 10000000no logging rate-limitno logging consoleno logging monitorenable secret 5!no aaa new-model!subscriber templating!multilink bundle-name authenticated!voice service voipip address trusted listipv4 2XX.XX.XX.XXipv4 2XX.XX.XX.XXaddress-hidingmode border-element license capacity 20allow-connections sip to sipredundancy-group 1fax protocol pass-through g711ulawsipbind control source-interface GigabitEthernet0/0/1bind media source-interface GigabitEthernet0/0/1rel1xx supported "rel100"session refreshasserted-id paiprivacy pstnearly-offer forcedmidcall-signaling passthru 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 14 of 51

g729 annexb-all!voice class codec 1codec preference 1 g711ulawcodec preference 2 g729r8codec preference 3 g722-56!voice class codec 2codec preference 1 g729r8codec preference 2 g711ulawcodec preference 3 g722-56!voice class sip-profiles 101request INVITE sip-header From modify " (.*) " " sip:[email protected] "request INVITE sip-header Diversion modify " sip:(.*)@(.*) " " sip:XXXXXX\[email protected]\2"!license udi pid ISR4321/K9 sn FDO19220MQ8license boot level appxk9license boot level uck9!diagnostic bootup level minimalspanning-tree extend system-id!redundancymode noneapplication redundancygroup 1name b2bhafusionConnectpriority 100 failover threshold 75 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 15 of 51

timers delay 30 reload 60control GigabitEthernet0/1/0 protocol 1data GigabitEthernet0/1/0track 1 shutdowntrack 2 shutdown!vlan internal allocation policy ascending!track 1 interface GigabitEthernet0/0/0 line-protocol!track 2 interface GigabitEthernet0/0/1 line-protocol!interface GigabitEthernet0/0/0description FusionConnect LANip address 10.80.13.10 255.255.255.0media-type rj45negotiation autoredundancy rii 8redundancy group 1 ip 10.80.13.20 exclusive!interface GigabitEthernet0/0/1description FusionConnect WANip address 1XX.XX.XX.XX 255.255.255.128negotiation autoredundancy rii 9redundancy group 1 ip 1XX.XX.XX.XX exclusive!interface GigabitEthernet0/1/0description CUBE HA 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 16 of 51

ip address 10.89.20.100 255.255.255.0negotiation auto!interface GigabitEthernet0vrf forwarding Mgmt-intfno ip addressnegotiation auto!interface Vlan1no ip addressshutdown!ip forward-protocol ndno ip http serverno ip http secure-serverip route 0.0.0.0 0.0.0.0 1XX.XX.XX.XXip route 10.80.0.0 255.255.0.0 10.80.13.1ip route 172.16.0.0 255.255.0.0 10.80.13.1!control-plane!mgcp behavior rsip-range tgcp-onlymgcp behavior comedia-role nonemgcp behavior comedia-check-media-src disablemgcp behavior comedia-sdp-force disable!mgcp profile default!dial-peer voice 500 voipdescription Outgoing Call from PBX to PSTN-LAN facing 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 17 of 51

huntstopsession protocol sipv2session target sip-serversession transport udpincoming called-number [0-9]Tvoice-class codec 1voice-class sip asserted-id paivoice-class sip options-keepalivevoice-class sip bind control source-interface GigabitEthernet0/0/0voice-class sip bind media source-interface GigabitEthernet0/0/0dtmf-relay rtp-ntefax-relay ecm disablefax rate disablefax nsf 000000fax protocol pass-through g711ulawno vad!dial-peer voice 510 voipdescription Outgoing Call from PBX to PSTN-WAN facinghuntstopdestination-pattern [0-9]Tsession protocol sipv2session target sip-serversession transport udpvoice-class codec 1voice-class sip asserted-id paivoice-class sip profiles 101voice-class sip options-keepalivevoice-class sip bind control source-interface GigabitEthernet0/0/1voice-class sip bind media source-interface GigabitEthernet0/0/1 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 18 of 51

dtmf-relay rtp-ntefax-relay ecm disablefax rate disablefax nsf 000000fax protocol pass-through g711ulawno vad!dial-peer voice 520 voipdescription Incoming Call to PBX from PSTN-WAN facinghuntstopsession protocol sipv2session target sip-serversession transport udpincoming called-number XXXXXX.voice-class codec 1voice-class sip asserted-id paivoice-class sip options-keepalivevoice-class sip bind control source-interface GigabitEthernet0/0/1voice-class sip bind media source-interface GigabitEthernet0/0/1dtmf-relay rtp-ntefax-relay ecm disablefax rate disablefax nsf 000000fax protocol pass-through g711ulawno vad!dial-peer voice 530 voipdescription Incoming Call to PBX from PSTN-LAN facinghuntstopdestination-pattern XXXXXX. 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 19 of 51

session protocol sipv2session target ipv4:10.80.23.3:5060session transport udpvoice-class codec 1voice-class sip asserted-id paino voice-class sip outbound-proxyvoice-class sip options-keepalivevoice-class sip bind control source-interface GigabitEthernet0/0/0voice-class sip bind media source-interface GigabitEthernet0/0/0dtmf-relay rtp-ntefax-relay ecm disablefax rate disablefax nsf 000000fax protocol pass-through g711ulawno vad!dial-peer voice 540 voipdescription Incoming Call to PBX from PSTN-WAN facing (for alternate DID which differs from the given DID range)huntstopsession protocol sipv2session target sip-serversession transport udpincoming called-number 3XXXXX.voice-class codec 1voice-class sip asserted-id paivoice-class sip options-keepalivevoice-class sip bind control source-interface GigabitEthernet0/0/1voice-class sip bind media source-interface GigabitEthernet0/0/1dtmf-relay rtp-nteno vad 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 20 of 51

!dial-peer voice 550 voipdescription Incoming Call to PBX from PSTN-LAN facing (for alternate DID which differs from the given DID range)huntstopdestination-pattern 3XXXXX.session protocol sipv2session target ipv4:10.80.23.3:5060session transport udpvoice-class codec 1voice-class sip asserted-id paino voice-class sip outbound-proxyvoice-class sip options-keepalivevoice-class sip bind control source-interface GigabitEthernet0/0/0voice-class sip bind media source-interface GigabitEthernet0/0/0dtmf-relay rtp-nteno vad!sip-uacredentials number XXXXXXXXXX username XXXXXXXXXX password 7 realm asteriskkeepalive target ipv4:2XX.XX.XX.XXauthentication username XXXXXXXXXX password 7timers keepalive active 10registrar ipv4:2XX.XX.XX.XX expires 60sip-server ipv4:2XX.XX.XX.XX:5060!line con 0stopbits 1line aux 0stopbits 1line vty 0 4 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 21 of 51

exec-timeout 0 0password XXXXXXlogin!end 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 22 of 51

Standby Cisco UBEfusionConnect2#sh run!version 16.3service timestamps debug datetime msec localtimeservice timestamps log datetime msec localtimeservice internalservice sequence-numbersno platform punt-keepalive disable-kernel-core!hostname fusionConnect2!boot-start-markerboot system flash -end-marker!vrf definition Mgmt-intf!address-family ipv4exit-address-family!address-family ipv6exit-address-family!logging queue-limit 10000logging buffered 10000000no logging rate-limitno logging consoleenable secret 5!no aaa new-model!subscriber templating!multilink bundle-name authenticated!voice service voip 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 23 of 51

ip address trusted listipv4 2XX.XX.XX.XXipv4 2XX.XX.XX.XXaddress-hidingmode border-element license capacity 20allow-connections sip to sipredundancy-group 1fax protocol pass-through g711ulawsipbind control source-interface GigabitEthernet0/0/1bind media source-interface GigabitEthernet0/0/1rel1xx supported "rel100"session refreshasserted-id paiprivacy pstnoutbound-proxy ipv4:2XX.XX.XX.XXearly-offer forcedmidcall-signaling passthrug729 annexb-all!voice class codec 1codec preference 1 g711ulawcodec preference 2 g729r8codec preference 3 g722-56!voice class codec 2codec preference 1 g729r8codec preference 2 g711ulawcodec preference 3 g722-56!voice class sip-profiles 101request INVITE sip-header From modify " (.*) " " sip:[email protected] "request INVITE sip-header Diversion modify " sip:(.*)@(.*) " " sip:XXXXXX\[email protected]\2"!license udi pid ISR4321/K9 sn FDO19220MQ9!diagnostic bootup level minimal 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 24 of 51

spanning-tree extend system-id!redundancymode noneapplication redundancygroup 1name b2bhafusionConnectpriority 100 failover threshold 75timers delay 30 reload 60control GigabitEthernet0/1/0 protocol 1data GigabitEthernet0/1/0track 1 shutdowntrack 2 shutdown!vlan internal allocation policy ascending!track 1 interface GigabitEthernet0/0/0 line-protocol!track 2 interface GigabitEthernet0/0/1 line-protocol!interface GigabitEthernet0/0/0description FusionConnect LANip address 10.80.13.11 255.255.255.0media-type rj45negotiation autoredundancy rii 8redundancy group 1 ip 10.80.13.20 exclusive!interface GigabitEthernet0/0/1description FusionConnect WANip address 1XX.XX.XX.XX 255.255.255.128negotiation autoredundancy rii 9redundancy group 1 ip 1XX.XX.XX.XX exclusive!interface GigabitEthernet0/1/0description CUBE HA 2016 Cisco Systems, Inc. All rights reserved.Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.comPage 25 of 51

ip address 10.89.20.101 255.255.255.0negotiation auto!interface GigabitEthernet0vrf forwarding Mgmt-intfno ip addressnegotiation auto!interface Vla

voice-class sip profiles 101 voice-class sip options-keepalive voice-class sip bind control source-interface GigabitEthernet0/0/1 voice-class sip bind media source-interface GigabitEthernet0/0/1 dtmf-relay rtp-nte fax-relay ecm disable fax rate disable fax nsf 000000 fax protocol pass-through g7