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

[Jai Rangi]

sessiontimer is off on my side, but I cant control carrier. Any suggested
workaround? Or say sorry to my customers and loose them.

On Wed, Mar 1, 2017 at 10:47 AM, Brian West <brian at freeswitch.org> wrote:

> 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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>
>
>
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>
> *Brian West*
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