[Freeswitch-users] sending 183 WITHOUT SDP from dialplan

[Moises Silva]

On Mon, Jun 10, 2013 at 12:36 PM, Matthew Meek <mmeek at contractworld.jobs>wrote:

> I am attempting to setup FS as an B2BUA SBC between a telco platform and a
> telco SIP trunk. Everything is fine except for one call-flow scenario:  **
> **
>
> ** **
>
> We need to sometimes “reject” calls by sending reason code 17, which is
> quite easy by sending a SIP 486. The issue is that the far-end first
> receives early media and then the reason code 17, and the far-end switch is
> bonding the B-leg media for 55 seconds instead of moving on in the
> dial-plan. When comparing this to our PRI build-out, the difference is that
> in the PRI-buildout, no early-media is sent. In the SIP world, we are
> sending a 183 with SDP to setup the early media… ****
>
> ** **
>
> If I don’t send early media, the telco will inject their own early media
> path… so I need a work-around.****
>
> ** **
>
> The telco is asking that we send specifically a 183 WITHOUT SDP, which I
> am having trouble figuring out how to do. I know how to send the 180
> WITHOUT SDP, a 183 WITH SDP, but I cannot find the solution to sending 183
> WITHOUT SDP…****
>
> ** **
>
> I know it is unusual to send 183 without SDP, but it is still RFC
> compliant…
>

>From a quick glance at the FreeSWITCH code, it does not seem possible
unless mod_sofia.c is modified to use nua_respond()
SIP_183_SESSION_PROGRESS without specifying an SDP. Relatively small change
probably, but still some coding is required.

*Moises Silva
**Manager, Software Engineering***

msilva at sangoma.com

Sangoma Technologies

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t.   +1 800 388 2475 (N. America)

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