Hello All,
I am having call failure issues when my softswitch sending a SIP INVITE
without SDP for a redirect call (Inbound call from SIP redirected back to an
offnet number). The call scenario is as follows
An Inbound call (PSTN to IP) comes in from SIP carrier. The user on SIP side
(our customer) enable the Find me feature to redirect the inbound to an offnet
number
An outbound call goes out from my softswitch to the SIP carrier. The INVITE
for that outbound call has diversion header but no SDP
In response to the outbound INVITE (without SDP) the upstream Gateway sent
me 480 Temporary Unavailable with this explanation After receiving the PSTN
call, the gateway sends out the first INVITE. It receives back the forwarded
INVITE (with diversion header), but the INVITE does not have any media
specified. So the gateway then sends out a new INVITE to the destination
number, but sets media a=sendonly. The call is being rejected because on the
egress side, the INVITE goes out with a=sendonly (because there was no SDP on
the Ingress INVITE), but the 200 OK comes back with no "a" setting, which means
a=sendrecv".
I believe we can redirect a call with diversion header and without SDP. Is
this explanation from my upstream provider is correct do I have to send an SDP
for the redirected call
Please reply me so that I can move forward with this
issue.
Regards,
Rashid Shakil.
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