[Freeswitch-users] T38 Fax, 488 Not Acceptable here

[Brian West]

This is actually on purpose, see note in code.

See sofia.c

/* Refuse all re-invites once we are doing T.38 */

            nua_respond(nh, SIP_488_NOT_ACCEPTABLE, TAG_END());

            switch_channel_hangup(channel, SWITCH_CAUSE_INCOMPATIBLE
_DESTINATION);


https://freeswitch.org/jira/browse/FS-10059

I can replicate it and I'm aware of it, turn off session timers if possible.

/b

On Wed, Mar 1, 2017 at 11:34 AM, Jai Rangi <jprangi at gmail.com> wrote:

> Why would FS reply with 488 not acceptable on Re-invite for T38 and the
> disconnect it.
> Here is the scenario.
> It only a leg, so no trans-coding etc.
>
> FS Sends Invite to Carrier
> Get 200 OK
> Send ACK.
> Send Re-invite with T38 in SDP.
> Got 200 OK,
> Fax starts.
> Everything is fine so far.
> After 15 Minutes,
> Gets a Re-invite  from Carrier with T.38 in SDP. (
> FS Reply with 488 Not Acceptable Here
> Send Bye.
>
> Two things:
> 1. 488 is Codec negotiation issue, Since the call was already setup with
> T38, why would FS wont accept. Can it be due to different FaxMaxbuffer and
> Datagram value. Cause that the only difference I see.
>
> 2nd Sholdn't it fall back to G711 in place of hanging up the call.
>
> Any insight will be helpful.
> Thank you,
>
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*Brian West*
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