[asterisk-dev] Add attributes to Asterisk T38 invite for MAX TNT Interop?

Kevin P. Fleming kpfleming at digium.com
Tue Dec 8 12:56:26 CST 2009

JR Richardson wrote:

> Here is what Asterisk sends to the tnt:
> m=image 20228 udptl t38
> a=T38FaxVersion:0
> a=T38MaxBitRate:14400
> a=T38FaxRateManagement:transferredTCF
> a=T38FaxMaxBuffer:0
> a=T38FaxMaxDatagram:0
> a=T38FaxUdpEC:t38UDPRedundancy

That is broken; T38FaxMaxDatagram should never be zero. Something is
wrong there.

As far as the non-present parameters, they are all optional and it does
not matter whether they are present or not, unless the answerer intends
to support that particular option/feature. Most T.38 SDP parameters are
*not* negotiated, but instead are declarative and indicate what that
endpoint wants to receive.

Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
skype: kpfleming | jabber: kpfleming at digium.com
Check us out at www.digium.com & www.asterisk.org

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