Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

No busy tone signal on SIP device vs. PBX

I have CUCM 7.0.2, this is call flow:

SIP)(with callback feature)--CCM7--GW2811(MGCP)--PRI(QSIG)--HICOM(HIPATH 400)--ANALOG PHONE

and the problem is that:

When I make a call to a phone that is in a busy third SIP phone does not understand the state of the phone, but will hear the busy tone in the logs but I can see that he does not understand the state of the phone. Receiving a SDP message "SIP 183 Session Progress" and not a "SIP 486 Busy Here".

How can I configure CUCM to translate the message "SIP 183 Session Progress" to "SIP 486 Busy Here"?

Is it a bug or a limitation of the third-party SIP devices?

I can see in the debug of the GW that first remote PBX sends a CALL PROC ( with busy tone) and after 30 sec. sends the signal busy that understands the SIP third-party as "SIP 486 Session Progress".