[SIPForum-discussion] FAX T.38

[Santosh Iyer]

The way that T.38 works is A calls B and negotiates an audio codec. then A sends fax tones over RTP. once B detects the fax tones it sends a Re-invite with T38. so wouldnt make sense for A to send re-invite to B with T38 because at this point its not clear even if B supports t38 or if it is setup properly to process FAX calls.

--- On Tue, 1/8/13, Moh, Yee-Kuang <ykmoh at pccwglobal.com> wrote:

From: Moh, Yee-Kuang <ykmoh at pccwglobal.com>
Subject: [SIPForum-discussion]  FAX T.38
To: discussion at sipforum.org
Date: Tuesday, January 8, 2013, 11:05 AM

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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