AudioCodes MediaPack MP-40 series, User Manual

Page: 166 / 180

MediaPack BRI Series
User's Manual 166 Document #: LTRT-83702
Figure A-8: Fax Transfer Enabled for IP-to-ISDN (e.g., T.38 Relay)
A.3.1.1 Fax without SIP RE-INVITE
The use fax without a SIP RE-INVITE transaction (fax autotransition), the user can add
T.38 as coder. If T.38 is added a coder it is negotiated in the SDP exchange. If Fax is
successfully negotiated, the system will switch to fax (T.38) without an additional SIP RE-
INVITE transaction.
Note: For fax autotransition Fax Signaling Mode must be set to T.38 Relay.