CUCM 7.0 interoperability SIP trunk with Hipath 8000 siemens.

[graziano_zamponi]

Hi, in this days I try with integration in object, i have interconnect the pbx hipath 8000 in sip trunk with cucm 7.0, the ccbs (call back, call completition on busy) don't work, i think it's not supported (why?) the other supplementary service are ok. There are any other solution over QSIG to interconnect the two pbxs, where ccbs work? any suggestion?

It's possible redound the SIP trunk with publisher and subscriber?

Thanks for your help.

Bye

Gz

[dakeller]

GZ,

Doing a bit of research on this topic, it appears that the callback busy feature is not supported over SIP trunk at this time.  This is not exclusive to Siemens.  It is also true when SIP integrating with Avaya, Nortel and Alcatel.  Each of these application notes includes the following comment in the 'limitations' section: "Call Completion (Callback) Feature is not supported on either system using standard SIP protocol"

Cisco does support CBB over QSIG links to most major PBX's, so at this time, if you require CBB support, you would need to implement a QSIG trunk to get that level of integration.

Thanks,

Dan Keller

Technical Marketing Engineer