FAX on H.248/MEGACO

Hi,

 

I've been asked about something not clear on specs: When a MG receives
fax and/or modem tones on RTP port, it should change the codecs in order
to allow tones to be passed in a correct way to be decoded as a fax or
modem in the other side. There are some options (i.e. using G.711 or
T.38). This way, the MG which detected the fax tone must set up a new
codec. For this, we have two options: automatic or negotiated. 

It's not clear on RFC which of these options is mandatory for the MG, or
if both of them. Could you help me with this?

Would someone could provide call-flows regarding fax/modem detection?

 

Thanks,

ANDRE

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