Hi all.

Below is the tail end of a SIP conversation whereby I dialed a PSTN telephone number and let it ring but hung up before the PSTN phone was answered. The SER sent the PSTN gateway a CANCEL message and it replied and all seemed well until the very end of the conversation where there are multiple "487 Request Terminated" messages transmitted from SER to the IP phone.

Can anyone tell me if this is "normal" or if I need to worry about this?

Regards, Paul

IP Legend: ------------------------------------- 68.84.10.10 - PUBLIC SIDE OF FIREWALL 68.84.10.20 - IP ADDRESS OF SER PROXY 68.84.10.30 - IP ADDRESS OF PSTN GATEWAY

U 2005/01/21 10:43:36.874272 68.84.10.10:63689 -> 68.84.10.20:5060 CANCEL sip:4075551212@mycompany.com;user=phone SIP/2.0. Via: SIP/2.0/UDP 192.168.0.83:63689;branch=z9hG4bK868145b476db8dae. From: "Paul" sip:3212514231@mycompany.com;user=phone;tag=16ec22902b85a039. To: sip:4075551212@mycompany.com;user=phone. Call-ID: 42c962bf359504ab@192.168.0.83. CSeq: 30333 CANCEL. User-Agent: Grandstream BT100 1.0.5.16. Max-Forwards: 70. Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE. Content-Length: 0. .

# U 2005/01/21 10:43:36.877795 68.84.10.20:5060 -> 68.84.10.30:5060 CANCEL sip:4075551212@68.84.10.30;user=phone SIP/2.0. Via: SIP/2.0/UDP 68.84.10.20;branch=z9hG4bKd753.8322b441.0. Via: SIP/2.0/UDP 192.168.0.83:63689;received=68.84.10.10;branch=z9hG4bK868145b476db8dae. From: "Paul" sip:3212514231@mycompany.com;user=phone;tag=16ec22902b85a039. To: sip:4075551212@mycompany.com;user=phone. Call-ID: 42c962bf359504ab@192.168.0.83. CSeq: 30333 CANCEL. User-Agent: Grandstream BT100 1.0.5.16. Max-Forwards: 16. Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE. Content-Length: 0. .

# U 2005/01/21 10:43:36.877884 68.84.10.20:5060 -> 68.84.10.10:63689 SIP/2.0 200 canceling. Via: SIP/2.0/UDP 192.168.0.83:63689;branch=z9hG4bK868145b476db8dae;received=68.84.10.10. From: "Paul" sip:3212514231@mycompany.com;user=phone;tag=16ec22902b85a039. To: sip:4075551212@mycompany.com;user=phone;tag=8dfa8202461711560b5fb8c33916f682-1b42. Call-ID: 42c962bf359504ab@192.168.0.83. CSeq: 30333 CANCEL. Content-Length: 0. .

# U 2005/01/21 10:43:36.934535 68.84.10.30:5060 -> 68.84.10.20:5060 SIP/2.0 200 OK. Via: SIP/2.0/UDP 68.84.10.20;branch=z9hG4bKd753.8322b441.0. Via: SIP/2.0/UDP 192.168.0.83:63689;received=68.84.10.10;branch=z9hG4bK868145b476db8dae. To: sip:4075551212@mycompany.com;user=phone. From: "Paul" sip:3212514231@mycompany.com;user=phone;tag=16ec22902b85a039. Call-ID: 42c962bf359504ab@192.168.0.83. CSeq: 30333 CANCEL. User-Agent: Grandstream BT100 1.0.5.16 . Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, OPTIONS, INFO, SUBSCRIBE. Content-Length: 0. .

# U 2005/01/21 10:43:36.955761 68.84.10.30:5060 -> 68.84.10.20:5060 SIP/2.0 487 Request Terminated. Via: SIP/2.0/UDP 68.84.10.20;branch=z9hG4bKd753.8322b441.0. Via: SIP/2.0/UDP 192.168.0.83:63689;rport=63689;received=68.84.10.10;branch=z9hG4bK868145b476db8dae. To: sip:4075551212@mycompany.com;user=phone;tag=06b020d6. From: "Paul" sip:3212514231@mycompany.com;user=phone;tag=16ec22902b85a039. Call-ID: 42c962bf359504ab@192.168.0.83. CSeq: 30333 INVITE. Record-Route: sip:68.84.10.30:5060;lr. Record-Route: sip:68.84.10.20;ftag=16ec22902b85a039;lr=on. Content-Length: 0. .

# U 2005/01/21 10:43:36.955950 68.84.10.20:5060 -> 68.84.10.30:5060 ACK sip:4075551212@68.84.10.30;user=phone SIP/2.0. Via: SIP/2.0/UDP 68.84.10.20;branch=z9hG4bKd753.8322b441.0. From: "Paul" sip:3212514231@mycompany.com;user=phone;tag=16ec22902b85a039. Call-ID: 42c962bf359504ab@192.168.0.83. To: sip:4075551212@mycompany.com;user=phone;tag=06b020d6. CSeq: 30333 ACK. Content-Length: 0. .

# U 2005/01/21 10:43:36.956037 68.84.10.20:5060 -> 68.84.10.10:63689 SIP/2.0 487 Request Terminated. Via: SIP/2.0/UDP 192.168.0.83:63689;rport=63689;received=68.84.10.10;branch=z9hG4bK868145b476db8dae. To: sip:4075551212@mycompany.com;user=phone;tag=06b020d6. From: "Paul" sip:3212514231@mycompany.com;user=phone;tag=16ec22902b85a039. Call-ID: 42c962bf359504ab@192.168.0.83. CSeq: 30333 INVITE. Record-Route: sip:68.84.10.30:5060;lr. Record-Route: sip:68.84.10.20;ftag=16ec22902b85a039;lr=on. Content-Length: 0. .

# U 2005/01/21 10:43:36.976267 68.84.10.10:63689 -> 68.84.10.20:5060 ACK sip:4075551212@mycompany.com;user=phone SIP/2.0. Via: SIP/2.0/UDP 192.168.0.83:63689;branch=z9hG4bK868145b476db8dae. From: "Paul" sip:3212514231@mycompany.com;user=phone;tag=16ec22902b85a039. To: sip:4075551212@mycompany.com;user=phone;tag=06b020d6. Contact: sip:3212514231@192.168.0.83:63689;user=phone. Proxy-Authorization: DIGEST username="3212514231", realm="mycompany.com", algorithm=MD5, uri="sip:4075551212@mycompany.com;user=phone", nonce="41f12450f15d3b4a9fb6cd05506a6030c7165718", response="d9a2404031e7404ad89df3bef3d5dfd4". Call-ID: 42c962bf359504ab@192.168.0.83. CSeq: 30333 ACK. User-Agent: Grandstream BT100 1.0.5.16. Max-Forwards: 70. Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE. Content-Length: 0. .

# U 2005/01/21 10:43:37.152117 68.84.10.20:5060 -> 68.84.10.10:63689 SIP/2.0 487 Request Terminated. Via: SIP/2.0/UDP 192.168.0.83:63689;rport=63689;received=68.84.10.10;branch=z9hG4bK868145b476db8dae. To: sip:4075551212@mycompany.com;user=phone;tag=06b020d6. From: "Paul" sip:3212514231@mycompany.com;user=phone;tag=16ec22902b85a039. Call-ID: 42c962bf359504ab@192.168.0.83. CSeq: 30333 INVITE. Record-Route: sip:68.84.10.30:5060;lr. Record-Route: sip:68.84.10.20;ftag=16ec22902b85a039;lr=on. Content-Length: 0. .

## U 2005/01/21 10:43:39.172156 68.84.10.20:5060 -> 68.84.10.10:63689 SIP/2.0 487 Request Terminated. Via: SIP/2.0/UDP 192.168.0.83:63689;rport=63689;received=68.84.10.10;branch=z9hG4bK868145b476db8dae. To: sip:4075551212@mycompany.com;user=phone;tag=06b020d6. From: "Paul" sip:3212514231@mycompany.com;user=phone;tag=16ec22902b85a039. Call-ID: 42c962bf359504ab@192.168.0.83. CSeq: 30333 INVITE. Record-Route: sip:68.84.10.30:5060;lr. Record-Route: sip:68.84.10.20;ftag=16ec22902b85a039;lr=on. Content-Length: 0. .

# U 2005/01/21 10:43:43.212328 68.84.10.20:5060 -> 68.84.10.10:63689 SIP/2.0 487 Request Terminated. Via: SIP/2.0/UDP 192.168.0.83:63689;rport=63689;received=68.84.10.10;branch=z9hG4bK868145b476db8dae. To: sip:4075551212@mycompany.com;user=phone;tag=06b020d6. From: "Paul" sip:3212514231@mycompany.com;user=phone;tag=16ec22902b85a039. Call-ID: 42c962bf359504ab@192.168.0.83. CSeq: 30333 INVITE. Record-Route: sip:68.84.10.30:5060;lr. Record-Route: sip:68.84.10.20;ftag=16ec22902b85a039;lr=on. Content-Length: 0. .

########### U 2005/01/21 10:43:47.252508 68.84.10.20:5060 -> 68.84.10.10:63689 SIP/2.0 487 Request Terminated. Via: SIP/2.0/UDP 192.168.0.83:63689;rport=63689;received=68.84.10.10;branch=z9hG4bK868145b476db8dae. To: sip:4075551212@mycompany.com;user=phone;tag=06b020d6. From: "Paul" sip:3212514231@mycompany.com;user=phone;tag=16ec22902b85a039. Call-ID: 42c962bf359504ab@192.168.0.83. CSeq: 30333 INVITE. Record-Route: sip:68.84.10.30:5060;lr. Record-Route: sip:68.84.10.20;ftag=16ec22902b85a039;lr=on. Content-Length: 0.

__________________________________ Do you Yahoo!? All your favorites on one personal page � Try My Yahoo! http://my.yahoo.com