Because I don't care what ya trunk to me with (Avaya, Nortel, Cisco, Asterisk, etc), I tend to care less about the "end" user's equipment as I'm sure many here have had to do from time to time. (Interops with Avaya one day, Nortel the next, intertwined with CCM here, Asterisk there). Anyhow, was doing an interop with someone and they CUCM was sending 491's. Figured I'd ask here since I believe someone must have a "oh yea... that stupid thing..." response. The scenario: Caller (Cisco Equipment) --> Their Network --> The Interweb --> My network --> so on... Caller --> My phone --> I pick up --> Their phone disconnects, immediate CANCEL 491 SIP? Caller --> CCM --> Router --> My SBC --> SIP/200 OK At that EXACT MOMENT of the SIP/200 OK: CCM sees SIP/481 : *Aug 10 20:38:45.295: //238407/000000000000/SIP/Call/sipSPICallInfo: Disconnect Cause (CC) : 16 Disconnect Cause (SIP) : 481 Anyone have a generic Cisco router config they'd care to share? I was fortunate enough to have them send me their end (implemented VoIP related garbage): voice call send-alert voice call carrier capacity active voice rtp send-recv voice service voip allow-connections sip to sip h323 sip bind control source-interface GigabitEthernet0/0.3 bind media source-interface GigabitEthernet0/0.3 voice class codec 1 codec preference 1 g729r8 codec preference 2 g711ulaw voice class h323 1 h225 timeout tcp establish 3 ccm-manager fallback-mgcp ccm-manager redundant-host xx.yy.z.15 ccm-manager mgcp ccm-manager music-on-hold ccm-manager config server xx.yy.z.16 ccm-manager config fax interface-type fax-mail interface GigabitEthernet0/0.3 description Voice VLAN encapsulation dot1Q 3 ip address xx.yy.z.1 255.255.255.0 ip helper-address vv.vv.v.v4 ip pim sparse-dense-mode ip cgmp no cdp enable dial-peer voice 9000 voip description ** Outbound 10-digit ** preference 1 destination-pattern 1[2-9]......... session protocol sipv2 session target ipv4:this.is.me.at.33 session transport udp fax-relay ecm disable no vad sip-ua call-manager-fallback max-conferences 8 ip source-address xx.yy.z.1 port 2000 max-ephones 48 max-dn 48 transfer-pattern 503....... default-destination 2000 voicemail xxxxxxxxxx SIP Messages: (ala ngrep ;)) U this.is.my.ip.33:5060 -> this.is.their.ip.131:5060 SIP/2.0 200 OK v: SIP/2.0/UDP this.is.their.ip.131:5060;branch=z9hG4bK1E3E f: "SIP Test DID"<sip:1503xxxyyyy at this.is.their.ip.131>;tag=2633AAF8-1A7C t: <sip:1212aaabbbb at this.is.my.ip.33>;tag=4483814b840cda0de9102ed591a599fc i: 15E4B9A3-A3F611DF-91EEFF90-66FF34BF at this.is.their.ip.131 CSeq: 101 INVITE m: <sip:+1212aaabbbb at this.is.my.ip.33:5060;transport=udp> c: application/sdp l: 111 v=0 o=- 58501 5850100 IN IP4 this.is.my.ip.38 s=- c=IN IP4 this.is.my.ip.38 t=0 0 m=audio 18168 RTP/AVP 0 18 U this.is.their.ip.131:57731 -> this.is.my.ip.33:5060 CANCEL sip:1212aaabbbb at this.is.my.ip.33:5060 SIP/2.0 Via: SIP/2.0/UDP this.is.their.ip.131:5060;branch=z9hG4bK1E3E From: "SIP Test DID" <sip:1503xxxyyyy at this.is.their.ip.131>;tag=2633AAF8-1A7C To: <sip:1212aaabbbb at this.is.my.ip.33>;tag=4483814b840cda0de9102ed591a599fc Date: Tue, 10 Aug 2010 20:38:36 GMT Call-ID: 15E4B9A3-A3F611DF-91EEFF90-66FF34BF at this.is.their.ip.131 CSeq: 101 CANCEL Max-Forwards: 70 Timestamp: 1281472724 Reason: Q.850;cause=16 Content-Length: 0.. -- =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ J. Oquendo SGFA, SGFE, C|EH, CNDA, CHFI, OSCP, CPT "It takes 20 years to build a reputation and five minutes to ruin it. If you think about that, you'll do things differently." - Warren Buffett 227C 5D35 7DCB 0893 95AA 4771 1DCE 1FD1 5CCD 6B5E http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x5CCD6B5E