[SIPForum-discussion] Call Disconnect issue with Cisco AS5300 running SIP

[Louis Wu]

Hi All,

I have a Cisco AS5300 using SIP and initiate SIP call to a SIP server YATE (v 
1.3.0). 

I have a call disconnect problem whenever my Cisco receive a 183 Session 
Progress message from the YATE server. The symptoms are listed as below.

1. Cisco AS5300 send an INVITE to the YATE server
2. YATE returns a 100 Trying message
3. YATE returns a 183 Session Progress
4. YATE returns a 200 OK 
5. Two-way-audio starts (start conversation as usual), but at the ISDN side 
of the Cisco, the call is shown to be "not connected"
6. Cisco sends a ACK
7. Cisco sends a BYE
8. YATE returns a 100 Trying
9. Cisco sends a BYE
10. YATE returns a 200 OK
11. Call disconnect with status message saying "no answer" at the calling 
party's mobile handset
12. Cisco logs a Disconnect Cause (CC) : 16 (SIP) : 200

If the YATE returns a 180 Session Progress in (3) above, the call will be 
connected normally and works as usual.

Please give me your professional advice and resolution on the above 
disconnect issue.

Cheers
Louis