[asterisk-users] VoIP interconnection with Acme packet SBC

[Kasun Daminda]

Dear all,

I have found a issue when connecting my asterisk soft switch with Acme
packet SBC.

1) No problem for outgoing calls. ie asterisk to Acme SBC

2) Problem is at incoming. ie Acme to Asterisk

3) My asterisk is connected to a PSTN switch via SS7 with digium interface.

4) When I getting a call from Acme, call is connected, but once answered it
is disconnected.

5) I have taken lot of traces and found that session version that I sends on
SDP/session progress is not similar to session version on SDP/200 OK
message.
Acme also complain me, according to RFC3261, the SDP header should be
identical for both 200 OK and Session progress.

See bullet #2 in ch 13.2.1 (RFC 3261):
      o  If the initial offer is in an INVITE, the answer MUST be in a
         reliable non-failure message from UAS back to UAC which is
         correlated to that INVITE.  For this specification, that is
         only the final 2xx response to that INVITE.  *That same exact*
*         answer *MAY also be placed in any provisional responses sent
         prior to the answer.  The UAC MUST treat the first session
         description it receives as the answer, and MUST ignore any
         session descriptions in subsequent responses to the initial
         INVITE.

6) This was quote from the traces

*SDP at Session Progress (183 Session Progress, with session description)*


    Message body

        Session Description Protocol

            Session Description Protocol Version (v): 0

            Owner/Creator, Session Id (o): root 26823 26823 IN IP4
203.189.191.138

                Owner Username: root

                Session ID: 26823

                Session Version: *26823*


*SDP at 200OK*


    Message body

        Session Description Protocol

            Session Description Protocol Version (v): 0

            Owner/Creator, Session Id (o): root 26823 26824 IN IP4
203.189.191.138

                Owner Username: root

                Session ID: 26823

                Session Version: *26824*

**

Hope this info will enough to understand my question. I am grateful to you
if you can help me on this to solve the issue very soon.

**

*Kind Rgds*

*Daminda*
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