21 Oct
2019
21 Oct
'19
7:40 a.m.
On 20.10.19 23:14, Ingo Jürgensmann wrote:
So, basically it is working. Cisco documentation for fax setup in voice routers states that no more than 14.4k is supported.
Cisco is probably referring to T.38 which is something completely different. Cisco is actually one of the worst companies in regards to SIP. They speak weird edge-cases of the protocol and force G.729 onto their users.
T.38 actually is a protocol you could have a lot of fun with as it's fairly complicated, but flexible and has lots of broken implementations even on devices like the AVM Fritz!Box. There are Fax machines which will refuse to work with T.38 on a Fritz!Box as they will reliably trigger that bug.