Amendment 2 to Recommendation T.38 provides for the following updates:

·        Support of optional RTP encapsulation when using UDP transport.  The optional RTP encapsulation is used when both gateways indicate this capability during call setup. 

·        Description of the use of redundancy and FEC in the context of  UDP/RTP.

·        Annex B and Annex D are updated to include negotiation of a RTP-based T.38 capability.

·        Annex G is added to specify the signaling of RTP encapsulation of T.38 as a generic H.245 capability.

·        Clarification of the version negotiation procedures introduced in T.38 Amendment 1.

·        Modification of “no-signal” to allow it to be sent between modem changes (currently practice in implementations).