Hi,
I've some problems to communicate between an application and CUCM via secure SIP trunk. I configured the secure SIP trunk according to
https://supportforums.cisco.com/docs/DOC-18689. The secure SIP trunk in general seems to work but establishing a secure encrypted SIP connection is not working. The message flow is as follows:
CUCM Application
INVITE -------->
<--------- OK including SDP with parameter 'crypto'
ACK ----------> including SDP without parameter 'crypto'
BYE ----------> Reason: Q.850; cause=47
What does the error code in the BYE message mean ? What's the root cause ? Is there something wrong with the application certificate, which I imported at the CUCM ? Which extensions and extended keys must be included in the application certificate ?
Hope the description of the problem is understandable.
Thanks for any help !
Regards,
Detlef