[SIPForum-discussion] SIP Testing (INVITE without SDP)

[Shakil, Rashid]

Ravi,

 

The proxy on the access side is Recursive. 

 

Regards,

 

Rashid Shakil

 

-----Original Message-----
From: Ravi Siebel [mailto:ravi_siebel at yahoo.com] 
Sent: Friday, March 14, 2008 2:41 AM
To: Shakil, Rashid; discussion at sipforum.org
Subject: Re: [SIPForum-discussion] SIP Testing (INVITE without SDP)

 

Hi Shakil,

 

Could, please let me know the type of proxy available on the access side
?

(Recursive or Non-Recursive)

 

Regards,

Ravi 

"Shakil, Rashid" <rshakil at covad.com> wrote:

	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

	 

	1.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

	2.An outbound call goes out from my softswitch to the SIP
carrier. The INVITE for that outbound call has diversion header but no
SDP

	3.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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