Hi all,

I'm trying SIP Trunk between CUCM 7.1 and FS. Unfortunately MTP is not an option, what leaves me with a whole lot of problems.

The one I'm currently banging my head with is hold.

I do not have the traces here, I'll have my hands on them tomorrow... Meanwhile what happens is the following:

CISCO -> FS

->INVITE - no SDP

<-Trying

<-Ringing

<-200 - SDP

->ACK - SDP

At this point the call is setup and things work as they should.

Cisco tries hold with freeswitch

->INVITE - SDP with IP 0.0.0.0

<-200 - SPD as usual

-> ACK - no SDP

the call is On hold, freeswitch is playing MOH

microseconds later, cisco tries to recover the call and connect to its MOH server:

-> INVITE - no SDP

<- 200 - SDP as usual

-> ACK - Valid SDP pointing to a moh server

At this point freeswitch continues peacefully to play it's own MOH

Cisco is sending RTP but FS is ignoring it

From this point on the call is lost and will remain on MOH until someone hangs up... any atempt to recover the call fails.

I'm sorry for the lack of traces as pcaps, i'll add the tomorrow...

Have someone gone through this problem or have any idea on what can i try?

Best,