SIP Calls Disconnecting After 30 Minutes – ITSP

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Having issues with calls being disconnected after the Min Session Timer expires, which by default on a Cisco UC system is 30 minutes. I found the Session-Expires SIP header was not being passed through by the Cisco CUBE. Therefore the 200 OK Message also did not contain the Session-Expires SIP Header back to the ITSP. As the ITSP did not receive the Session-Expires SIP Header the return 200 OK message, the call will be torn down (by the ITSP) after the Session_Expires timer expires (that was a mouth full).

Summary of what Users will see.

Call ends 29:59sec, the remote device (PSTN) will disconnect, however the Jabber Client (in my case) remained established, however obviously not connected to anything. The User then had to hangup the call.

To resolve this and allow the CUBE to effectively be transparent in SIP session timer refreshing process, we need to add the following command to the Voice Services VOIP -> SIP menu or to the Dial-Peer.

*** Global ***

geneaic2vg001(config)#voice service voip
geneaic2vg001(conf-voi-serv)#sip
geneaic2vg001(conf-serv-sip)#session refresh

*** Dial-Peer ***

geneaic2vg001(config)#dial-peer voice 1
geneaic2vg001(config-dial-peer)#voice-class sip session refresh

****** BEFORE THE CHANGE *******

Mar 23 10:31:45.248: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
Received:
UPDATE sip:0232282750@192.168.240.20:5060 SIP/2.0
Via: SIP/2.0/UDP 210.193.202.100:5060;branch=z9hG4bKhee5hq103g3h299jm431cmsp90n13.1
From: <sip:0428842486@210.193.202.4;user=phone>;tag=1640860859-1490224603520-
To: “282282750 282282750″<sip:0232282750@macquarietelecom.com;user=phone>;tag=66B126F4-1974
Call-ID: BW101643520230317-1846521292@210.193.202.4
CSeq: 1009217731 UPDATE
Contact: <sip:0428842486@210.193.202.100:5060;transport=udp>
Supported: timer
Min-SE: 1800
Session-Expires: 1800;refresher=uac
Max-Forwards: 29
Content-Length: 0

Mar 23 10:31:45.252: //1258857/7263E0D597B2/SIP/Msg/ccsipDisplayMsg:
Sent:
UPDATE sip:0232282750@192.168.240.10:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.240.20:5060;branch=z9hG4bKA2A101A89
From: <sip:+61428842486@macquarietelecom.com>;tag=66B126B8-570
To: <sip:0232282750@192.168.240.10>;tag=9418806~1fee70d6-16c8-4723-9338-a8bd4c2554c2-28985743
Date: Wed, 22 Mar 2017 23:16:43 GMT
Call-ID: 726519BD-E8C11E7-97B8AB1C-AE5BD661@192.168.240.20
User-Agent: Cisco-SIPGateway/IOS-15.5.1.T2
Max-Forwards: 70
Supported: timer,resource-priority,replaces,sdp-anat
Timestamp: 1490225505
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
CSeq: 102 UPDATE
Contact: <sip:+61428842486@192.168.240.20:5060>
Min-SE: 1800
Content-Length: 0

Mar 23 10:31:45.252: //1258856/7263E0D597B2/SIP/Msg/ccsipDisplayMsg:
Sent:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 210.193.202.100:5060;branch=z9hG4bKhee5hq103g3h299jm431cmsp90n13.1
From: <sip:0428842486@210.193.202.4;user=phone>;tag=1640860859-1490224603520-
To: “282282750 282282750″<sip:0232282750@macquarietelecom.com;user=phone>;tag=66B126F4-1974
Date: Wed, 22 Mar 2017 23:31:45 GMT
Call-ID: BW101643520230317-1846521292@210.193.202.4
Server: Cisco-SIPGateway/IOS-15.5.1.T2
CSeq: 1009217731 UPDATE
Allow-Events: telephone-event
Contact: <sip:0232282750@192.168.240.20:5060>
Supported: timer
Content-Length: 0

Mar 23 10:31:45.256: //1258857/7263E0D597B2/SIP/Msg/ccsipDisplayMsg:
Received:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.240.20:5060;branch=z9hG4bKA2A101A89
From: <sip:+61428842486@macquarietelecom.com>;tag=66B126B8-570
To: <sip:0232282750@192.168.240.10>;tag=9418806~1fee70d6-16c8-4723-9338-a8bd4c2554c2-28985743
Date: Wed, 22 Mar 2017 23:31:45 GMT
Call-ID: 726519BD-E8C11E7-97B8AB1C-AE5BD661@192.168.240.20
Server: Cisco-CUCM11.5
CSeq: 102 UPDATE
Allow-Events: presence, kpml
Supported: X-cisco-srtp-fallback
Supported: Geolocation
Session-ID: 000066cd00105000a00000059a3c7800;remote=24d15a06715421e863228f8ab9418806
P-Asserted-Identity: “Ben Morgan” <sip:2750@192.168.240.10>
Remote-Party-ID: “Ben Morgan” <sip:2750@192.168.240.10>;party=called;screen=yes;privacy=off
Contact: <sip:0232282750@192.168.240.10:5060>;+u.sip!devicename.ccm.cisco.com=”CSFBENMORGAN”;video;bfcp
Content-Length: 0

****** AFTER THE CHANGE *******

Mar 23 01:08:37.492: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
Received:
UPDATE sip:0232282750@192.168.241.20:5060 SIP/2.0
Via: SIP/2.0/UDP 210.193.202.100:5060;branch=z9hG4bK13p7q400b01053t5s670cms1eq4b3.1
From: <sip:0428842486@210.193.202.4;user=phone>;tag=1132754884-1490226813863-
To: “282282750 282282750″<sip:0232282750@macquarietelecom.com;user=phone>;tag=5C0C230-1AB1
Call-ID: BW105333863230317-1887904559@210.193.202.4
CSeq: 1010322902 UPDATE
Contact: <sip:0428842486@210.193.202.100:5060;transport=udp>
Supported: timer
Min-SE: 1800
Session-Expires: 1800;refresher=uac
Max-Forwards: 29
Content-Length: 0

Mar 23 01:08:37.492: //667358/97DC18C3A58D/SIP/Msg/ccsipDisplayMsg:
Sent:
UPDATE sip:0232282750@192.168.240.10:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.241.20:5060;branch=z9hG4bK892821863
From: <sip:+61428842486@macquarietelecom.com>;tag=5C0C20C-15FA
To: <sip:0232282750@192.168.240.10>;tag=9427326~1fee70d6-16c8-4723-9338-a8bd4c2554c2-28987887
Date: Wed, 22 Mar 2017 23:53:33 GMT
Call-ID: 97DD5113-E9111E7-A593BCA3-13A15289@192.168.241.20
User-Agent: Cisco-SIPGateway/IOS-15.5.1.T2
Max-Forwards: 70
Supported: timer,resource-priority,replaces,sdp-anat
Timestamp: 1490227717
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
CSeq: 102 UPDATE
Contact: <sip:+61428842486@192.168.241.20:5060>
Min-SE: 1800
Session-Expires: 1800;refresher=uac
Content-Length: 0

Mar 23 01:08:37.496: //667357/97DC18C3A58D/SIP/Msg/ccsipDisplayMsg:
Sent:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 210.193.202.100:5060;branch=z9hG4bK13p7q400b01053t5s670cms1eq4b3.1
From: <sip:0428842486@210.193.202.4;user=phone>;tag=1132754884-1490226813863-
To: “282282750 282282750″<sip:0232282750@macquarietelecom.com;user=phone>;tag=5C0C230-1AB1
Date: Thu, 23 Mar 2017 00:08:37 GMT
Call-ID: BW105333863230317-1887904559@210.193.202.4
Server: Cisco-SIPGateway/IOS-15.5.1.T2
CSeq: 1010322902 UPDATE
Allow-Events: telephone-event
Contact: <sip:0232282750@192.168.241.20:5060>
Session-Expires: 1800;refresher=uac
Require: timer
Supported: timer
Content-Length: 0

Mar 23 01:08:37.500: //667358/97DC18C3A58D/SIP/Msg/ccsipDisplayMsg:
Received:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.241.20:5060;branch=z9hG4bK892821863
From: <sip:+61428842486@macquarietelecom.com>;tag=5C0C20C-15FA
To: <sip:0232282750@192.168.240.10>;tag=9427326~1fee70d6-16c8-4723-9338-a8bd4c2554c2-28987887
Date: Thu, 23 Mar 2017 00:08:37 GMT
Call-ID: 97DD5113-E9111E7-A593BCA3-13A15289@192.168.241.20
Server: Cisco-CUCM11.5
CSeq: 102 UPDATE
Allow-Events: presence, kpml
Supported: X-cisco-srtp-fallback
Supported: Geolocation
Session-Expires: 1800;refresher=uac
Require: timer
Session-ID: 0000190000105000a00000059a3c7800;remote=3062c55c0330af1676d56a3ab9427326
P-Asserted-Identity: “Ben Morgan” <sip:2750@192.168.240.10>
Remote-Party-ID: “Ben Morgan” <sip:2750@192.168.240.10>;party=called;screen=yes;privacy=off
Contact: <sip:0232282750@192.168.240.10:5060>;+u.sip!devicename.ccm.cisco.com=”CSFBENMORGAN”;video;bfcp
Content-Length: 0

As we can now see the CUBE passes the Session-Expires SIP Header through to the CUCM Server. The call can now keep refreshing and remain up long past 30 mins.

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