488 on reception T38 re-invite

[Kwekkel]

Hi,

I send an outbound fax call and after call establishment the remote party sends a T38 re-invite.
The response is 488 Not acceptable here.

Any ideas/suggestions?

Thanks.

 

[Adrian Fretwell]

What is generating the 488, is it FreeSwitch or an endpoint?

Most often a 488 occurs when there is no codec intersection between the endpoints.

Check you have t38-passthru set to true and enabled in the relevant SIP profile.

 

[Kwekkel]

Set t38-passthru to true fixed the problem. How could i have missed this...

Thanks for helping me out.