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Mitel Software Applications / Re: Exchange Unified Messaging
« on: February 04, 2009, 12:07:31 AM »
Does the decode of the SIP session show a REINVITE from G.(whatever you are using) to T.38 ? If so which party is requesting the signaling change? Exchange 2007 with SP1 will do inband fax tone detection and media negotiation. You need to do this on one side or the other, probably on the Mitel side if you are already using it there... If you are detecting faxes in the 3300 you should disable it on exchange. When exchange gets a sip reinvite from the mitel to T.38 media it will wait for a fax whether it receives a tone or not. If there is no fax involved at all then either the dial plan is forcing T.38 or some option in the PBX is forcing it.