[SIPForum-discussion] FAX T.38

[Abhisek Acharya]

Hey Moh,

Hi Hope you are doing welll....Lets talk about the fax mechanism.Lets us
assume a call sets up in some other codec like g.729/g.722 etc.Then either
party can initiate a FAX ..In todays time we have fax machines from where
we can first make a audio call and post that we can press the fax botton to
initiate the fax call.

So to your question the answer is yes.A party also can make a FOIP call and
to do so it will switch its codec to T.38 by sending a RE-INVITE message.If
you have any problem regarding a FAX issue please share me the signaling
trace.

NOTE:If the call is already in PCMU/PCMA then switching to T.38 is not
necessary as PCMU is good enough for fax stuff.


Regards
Abhisek Acharya
GS-LAB,PUNE

On Tue, Jan 8, 2013 at 11:05 AM, Moh, Yee-Kuang <ykmoh at pccwglobal.com>wrote:

> Hi,****
>
> ** **
>
> Good day. Wondering using Fax T.38, isn’t that B-party has always send
> Re-INVITE T.38 upon codec negotiation? Can A-party send Re-INVITE T.38 if
> B-party doesn’t? ****
>
> ** **
>
> Thanks in advance.****
>
> ** **
>
> Regards
> moh ****
>
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