Mid-call Re-INVITE/UPDATE Consumption
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- Jonas Malone
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1 The Mid-call Re-INVITE/UPDATE consumption feature helps consume unwanted mid-call Re-INVITEs/UPDATEs locally avoiding interoperability issues that may arise due to these Re-INVITES. Feature Information for Mid-call Re-INVITE Consumption, page 1 Prerequisites, page 2 Restrictions, page 2 Information About CUBE, page 3 How to Configure Cisco UBE Mid-call Re-INVITE Consumption, page 3 Verifying and Troubleshooting Cisco UBE, page 7 Mid Call Codec Preservation, page 10 Feature Information for Mid-call Re-INVITE Consumption The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to An account on Cisco.com is not required. 1
2 Prerequisites Table 1: Feature Information for Mid-call Re-INVITE Consumption Feature Name Cisco UBE Mid-call Signalling Cisco UBE Mid-call Re-INVITE/UPDATE Consumption Releases 15.3(2)S, 15.3T 15.2(1)T Cisco IOS XE Release 3.6S Feature Information The Cisco UBE Mid-call signalling helps to disables codec negotiation in the middle of a call and preserves the codec negotiated before the call. The following keyword was introduced or modified: preserve-codec. The Mid-call Re-INVITE consumption feature consumes mid-call Re-INVITEs from CUBE and helps to avoid interoperability issues because of these re-invites The following commands were introduced or modified: midcall-signaling. Prerequisites Enable CUBE application on a device Restrictions SIP-H.323 calls are not supported. TDM Gateways are not supported. Session Description Protocol (SDP) -passthrough is not supported When codec T is configured, the offer from CUBE has only audio codecs, and so the video codecs are not consumed. Re-invites are not consumed if media flow-around is configured. Re-invites are not consumed if media anti-tromboning is configured. Video transcoding is not supported. Secure Real-time Protocol - Real-time Protocol (SRTP-RTP) supplementary services are not supported. Multicast Music On Hold (MMOH) is not supported. 2
3 Information About CUBE When the midcall-signaling passthru media-change command is configured and high-density transcoder is enabled, there might be some impact on Digital Signal Processing (DSP) resources as the transcoder might be used for all the calls. Session timer is handled leg by leg whenever this feature is configured. Information About CUBE Mid-call Re-INVITE/UPDATE Consumption The purpose of Mid-call Re-INVITE Consumption is to ensure smooth interoperability of supplementary services (like audio hold, resume and call transfer) by consuming unnecessary re-invites (mid-call signaling) locally. This can be done in three different ways: Converting a delayed offer to an early offer Passthrough of mid-call signaling regarding media change Mid-call signaling is passed through only when bidirectional media like T.38 or video is added. Blocking all mid-call signaling for a specific SIP trunk. Note This feature should be used as a last resort only when there is no other option in CUBE. This is because configuring this feature can break video-related features. For Delay-offer Re-INVITE, the configured codec will be passed as an offer in 200 message to change the codec, the transcoder is added in the answer. How to Configure Cisco UBE Mid-call Re-INVITE Consumption Configuring Passthrough of Mid-call Signalling Perform this task to configure passthrough of mid-call signaling (as Re-invites) only when bidirectional media is added. SUMMARY STEPS 1. enable 2. configure terminal 3. Configure passthrough of mid-call signalling changes only when bidirectional media is added. midcall-signaling passthru media-change in Global VoIP configuration mode. voice-class sip mid-call signaling passthru media-change in dial-peer configuration mode. 4. end 3
4 Blocking All Mid-Call Signaling DETAILED STEPS Step 1 Step 2 enable Device> enable configure terminal Enables privileged EXEC mode. Enter your password if prompted. Enters global configuration mode. Step 3 Device# configure terminal Configure passthrough of mid-call signalling changes only when bidirectional media is added. midcall-signaling passthru media-change in Global VoIP configuration mode. voice-class sip mid-call signaling passthru media-change in dial-peer configuration mode. Re-Invites are passed through only when bidirectional media is added. In Global VoIP configuration mode: Device(config)# voice service voip Device(conf-voi-serv)# sip Device(conf-serv-sip)# midcall-signaling passthru media-change Step 4 In Dial-peer configuration mode: Device(config)# dial-peer voice 2 voip Device(config-dial-peer)# voice-class sip mid-call signaling passthru media-change end Exits to privileged EXEC mode. Blocking All Mid-Call Signaling Perform this task to block all mid-call signaling: 4
5 Blocking All Mid-Call Signaling SUMMARY STEPS 1. enable 2. configure terminal 3. Configure blocking of all mid-call signaling changes: midcall-signaling block in Global VoIP configuration mode. voice-class sip mid-call signaling block in dial-peer configuration mode. 4. end DETAILED STEPS Step 1 Step 2 enable Device> enable configure terminal Enables privileged EXEC mode. Enter your password if prompted. Enters global configuration mode. Step 3 Device# configure terminal Configure blocking of all mid-call signaling changes: midcall-signaling block in Global VoIP configuration mode. voice-class sip mid-call signaling block in dial-peer configuration mode. Mid-call signaling is always blocked. In Global VoIP configuration mode: Device(config)# voice service voip Device(conf-voi-serv)# sip Device(conf-serv-sip)# midcall-signaling block Step 4 In Dial-peer configuration mode: Device(config)# dial-peer voice 2 voip Device(config-dial-peer)# voice-class sip mid-call signaling block end Exits to privileged EXEC mode. 5
6 Configuring Delayed Offer to Early Offer Configuring Delayed Offer to Early Offer SUMMARY STEPS 1. enable 2. configure terminal 3. Configure conversion of a delayed offer to an early offer: voice-class sip early-offer forced in dial-peer configuration mode early-offer forced in global VoIP configuration mode 4. end DETAILED STEPS Step 1 Step 2 enable Device> enable configure terminal Enables privileged EXEC mode. Enter your password if prompted. Enters global configuration mode. Step 3 Device# configure terminal Configure conversion of a delayed offer to an early offer: voice-class sip early-offer forced in dial-peer configuration mode early-offer forced in global VoIP configuration mode In dial-peer configuration mode: Device (config) dial-peer voice 10 voip Device (config-dial-peer) voice-class sip early-offer forced Device (config-dial-peer) end In global VoIP SIP mode: Device(config)# voice service voip Device (config-voi-serv) sip Device (config-voi-sip) early-offer forced Device (config-voi-sip) end 6
7 Verifying and Troubleshooting Cisco UBE Step 4 end Exits to privileged EXEC mode. Verifying and Troubleshooting Cisco UBE Mid-call Re-INVITE/UPDATE Consumption Perform this task to verify mid-call Re-INVITE/UPDATE routing support on Cisco UBE SUMMARY STEPS 1. enable 2. debug ccsip all 3. debug voip ccapi inout DETAILED STEPS Step 1 enable Enables privileged EXEC mode. Device> enable Step 2 debug ccsip all Use this command to enable SIP related debugging. Device# debug ccsip all Received: INVITE sip: @[2208:1:1:1:1:1:1:1118]:5060 SIP/2.0 Via: SIP/2.0/UDP [2208:1:1:1:1:1:1:1115]:5060;branch=z9hG4bK83AE3 Remote-Party-ID: <sip: @[2208:1:1:1:1:1:1:1115]>;party=calling;screen=no;privacy=off From: <sip: @[2208:1:1:1:1:1:1:1115]>;tag=627460f To: <sip: @[2208:1:1:1:1:1:1:1118]> Date: Tue, 01 Mar :49:48 GMT Call-ID: B30FCDEB E0-8EDECB51-E9F6B1F1@2208:1:1:1:1:1:1:1115 Supported: 100rel,timer,resource-priority,replaces Require: sdp-anat Min-SE: 1800 Cisco-Guid: User-Agent: Cisco-SIPGateway/IOS-15.1(3.14.2)PIA16 Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER CSeq: 101 INVITE Max-Forwards: 70 Timestamp: Contact: <sip: @[2208:1:1:1:1:1:1:1115]:5060> Expires: 180 Allow-Events: telephone-event Content-Type: application/sdp Content-Disposition: session;handling=required 7
8 Verifying and Troubleshooting Cisco UBE Content-Length: 495 v=0 o=ciscosystemssip-gw-useragent IN IP6 2208:1:1:1:1:1:1:1115 s=sip Call c=in IP6 2208:1:1:1:1:1:1:1115 t=0 0 a=group:anat 1 2 m=audio RTP/AVP c=in IP6 2208:1:1:1:1:1:1:1115 a=mid:1 a=rtpmap:0 PCMU/8000 a=rtpmap:101 telephone-event/8000 a=fmtp: a=rtpmap:19 CN/8000 a=ptime:20 m=audio RTP/AVP c=in IP a=mid:2 a=rtpmap:0 PCMU/8000 a=rtpmap:101 telephone-event/8000 a=fmtp: a=rtpmap:19 CN/8000 a=ptime:20 Received: INVITE sip: @[2208:1:1:1:1:1:1:1117]:5060 SIP/2.0 Via: SIP/2.0/UDP [2208:1:1:1:1:1:1:1116]:5060;branch=z9hG4bK38ACE Remote-Party-ID: <sip: @[2208:1:1:1:1:1:1:1116]>;party=calling;screen=no;privacy=off From: <sip: @[2208:1:1:1:1:1:1:1116]>;tag=4fe8c9c-1630 To: <sip: @[2208:1:1:1:1:1:1:1117]>;tag= c-992 Date: Thu, 10 Feb :15:08 GMT Call-ID: 5DEDB77E-ADC BE770-8FCACF34@2208:1:1:1:1:1:1:1117 Supported: 100rel,timer,resource-priority,replaces,sdp-anat Min-SE: 1800 Cisco-Guid: User-Agent: Cisco-SIPGateway/IOS-15.1(3.14.2)PIA16 Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER CSeq: 101 INVITE Max-Forwards: 70 Timestamp: Contact: <sip: @[2208:1:1:1:1:1:1:1116]:5060> Expires: 180 Allow-Events: telephone-event Content-Type: application/sdp Content-Length: 424 v=0 o=ciscosystemssip-gw-useragent IN IP6 2208:1:1:1:1:1:1:1116 s=sip Call c=in IP6 2208:1:1:1:1:1:1:1116 t=0 0 m=image udptl t38 c=in IP6 2208:1:1:1:1:1:1:1116 a=t38faxversion:0 a=t38maxbitrate:14400 a=t38faxfillbitremoval:0 a=t38faxtranscodingmmr:0 a=t38faxtranscodingjbig:0 a=t38faxratemanagement:transferredtcf a=t38faxmaxbuffer:200 a=t38faxmaxdatagram:320 a=t38faxudpec:t38udpredundancy Step 3 debug voip ccapi inout The voice gateway sets up negotiating capability with the terminating VoIP leg. *Mar 1 15:36:05.028: //45/xxxxxxxxxxxx/CCAPI/cc_api_caps_ind: (dstvdbptr=0x637e C1E0, dstcallid=0x2c, srccallid=0x2d, caps={codec=0x4, fax_rate=0x2, vad=0x2, modem=0x0 codec_bytes=20, signal_type=2}) 8
9 Verifying and Troubleshooting Cisco UBE *Mar 1 15:36:05.028: //45/xxxxxxxxxxxx/CCAPI/ cc_api_caps_ind: (Playout: mode 0, initial 60,min 40, max 300) The capabilities are acknowledged for both call legs. *Mar 1 15:36:05.028: //45/xxxxxxxxxxxx/CCAPI/cc_api_caps_ack: (dstvdbptr=0x637e C1E0, dstcallid=0x2c, srccallid=0x2d, caps={codec=0x4, fax_rate=0x2, vad=0x2, modem=0x0 codec_bytes=20, signal_type=2, seq_num_start=2944}) *Mar 1 15:36:05.028: //44/xxxxxxxxxxxx/CCAPI/cc_api_caps_ack: (dstvdbptr=0x62ec 61A4, dstcallid=0x2d, srccallid=0x2c, caps={codec=0x4, fax_rate=0x2, vad=0x2, modem=0x0 codec_bytes=20, signal_type=2, seq_num_start=2944}) *Mar 1 15:36:05.032: //44/xxxxxxxxxxxx/CCAPI/cc_api_voice_mode_event: callid=0x2c *Mar 1 15:36:05.032: //44/45F2AAE28044/CCAPI/cc_api_voice_mode_event: Call Pointer =634A430C *Mar 1 15:36:05.032: //44/xxxxxxxxxxxx/SSAPP:-1:-1/sess_appl: ev(52=cc_ev_voice _MODE_DONE), cid(44), disp(0) *Mar 1 15:36:05.032: //44/45F2AAE28044/SSAPP:10002:21/ssaTraceSct: cid(44)st(ssa_cs_active)ev(ssa_ev_voice_mode_done) oldst(ssa_cs_conferencing)cfid(21)csize(2)in(1)fdest(1) *Mar 1 15:36:05.032: //44/45F2AAE28044/SSAPP:10002:21/ssaTraceSct: -cid2(45)st2 (SSA_CS_ACTIVE)oldst2(SSA_CS_ALERT_RCVD) *Mar 1 15:36:05.032: //44/45F2AAE28044/SSAPP:10002:21/ssaIgnore: cid(44), st(ss A_CS_ACTIVE),oldst(5), ev(52)! digit punched The phone at the terminating gateway enters digit1. *Mar 1 15:36:11.204: //45/xxxxxxxxxxxx/CCAPI/cc_api_call_digit_begin: (dstvdbptr=0x637ec1e0, dstcallid=0x2c, srccallid=0x2d, digit=1, digit_begin_flags=0x0, rtp_timestamp=0x0 rtp_expiration=0x0, dest_mask=0x2) *Mar 1 15:36:11.504: //45/xxxxxxxxxxxx/CCAPI/cc_api_call_digit_end: (dstvdbptr= 0x637EC1E0, dstcallid=0x2c, srccallid=0x2d, digit=1,duration=300,xrulecallingtag=0,xrulecalledtag=0, dest_mask=0x2), digit_tone_mode=0 The phone at the terminating gateway enters digit 2. *Mar 1 15:36:11.604: //45/xxxxxxxxxxxx/CCAPI/cc_api_call_digit_begin: (dstvdbpt r=0x637ec1e0, dstcallid=0x2c, srccallid=0x2d, digit=2, digit_begin_flags=0x0, rtp_timestamp=0x0 rtp_expiration=0x0, dest_mask=0x2) *Mar 1 15:36:11.904: //45/xxxxxxxxxxxx/CCAPI/cc_api_call_digit_end: (dstvdbptr= 0x637EC1E0, dstcallid=0x2c, srccallid=0x2d, digit=2,duration=300,xrulecallingtag=0,xrulecalledtag=0, dest_mask=0x2), digit_tone_mode=0 *Mar 1 15:36:14.476: //-1/xxxxxxxxxxxx/CCAPI/cc_handle_periodic_timer: Calling the callback, cctimerctx - 0x628B6330 *Mar 1 15:36:14.476: //-1/xxxxxxxxxxxx/CCAPI/ccTimerStart: cctimerctx - 0x628B6330!call hung up The user at the terminating gateway hangs up the call. 9
10 Mid Call Codec Preservation Mid Call Codec Preservation You can enable or disable codec negotiation in the middle of a call. This method defines whether a codec can be negotiated after a call has been initiated. Configuring Mid Call Codec Preservation at the Global Level SUMMARY STEPS 1. enable 2. configure terminal 3. voice service voip 4. sip 5. midcall-signaling preserve-codec 6. exit DETAILED STEPS Step 1 Step 2 enable Device> enable configure terminal Enables privileged EXEC mode. Enter your password if prompted. Enters global configuration mode. Step 3 Device# configure terminal voice service voip Enters voice service VoIP configuration mode. Step 4 Device(config)# voice service voip sip Enters voice service VoIP SIP configuration mode. Step 5 Device(conf-voi-serv)# sip midcall-signaling preserve-codec Device(conf-serv-sip)# midcall-signaling preserve-codec Disables codec negotiation in the middle of a call and preserves the codec negotiated before the call. 10
11 Configuring Mid Call Codec Preservation at the Dial Peer Level Step 6 exit Device(conf-serv-sip)# exit Exits voice service SIP configuration mode and returns to global configuration mode. Configuring Mid Call Codec Preservation at the Dial Peer Level SUMMARY STEPS 1. enable 2. configure terminal 3. dial-peer voice dial-peer tag voip 4. voice-class sip midcall-signaling preserve-codec 5. exit DETAILED STEPS Step 1 Step 2 enable Device> enable configure terminal Enables privileged EXEC mode. Enter your password if prompted. Enters global configuration mode. Step 3 Device# configure terminal dial-peer voice dial-peer tag voip Enters dial-peer voice configuration mode. Step 4 Device(config)# dial-peer voice 2 voip voice-class sip midcall-signaling preserve-codec Device(conf-dial-peer)# voice-class sip midcall-signaling preserve-codec Disables codec negotiation in the middle of a call and preserves the codec negotiated before the call. 11
12 Configuring Mid Call Codec Preservation at the Global Level Step 5 exit Device(config-dial-peer)# exit Exits dial-peer voice configuration mode and returns to global configuration mode. Configuring Mid Call Codec Preservation at the Global Level Configuring Mid Call Codec Preservation at the Global Level Device(config)# voice service voip Device(conf-voi-serv)# no ip address trusted authenticate Device(conf-voi-serv)# allow-connections sip to sip Device(conf-voi-serv)# sip Device(conf-serv-sip)# midcall-signaling preserve-codec Configuring Mid Call Codec Preservation at the Dial Peer Level Configuring Mid Call Codec Preservation at the Dial Peer Level dial-peer voice 107 voip destination-pattern session protocol sipv2 session target ipv4: incoming called-number voice-class codec 1 offer-all! dial-peer voice 110 voip destination-pattern session protocol sipv2 session target ipv4: incoming called-number voice-class codec 1 offer-all voice-class sip midcall-signaling preserve-codec! 12
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