TRENDnet TVP-224HR - Manual (Page 64)

TVP-224HR User’s Guide
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tone to the PSTN. This method in which the TVP-224HR handles DTMF tone is
so called DTMF relay.
The TVP-224HR handles DTMF relay per H.323 specifications. Certain third
party VoIP devices may handle DTMF relay per IMTC standard. For the TVP-
224HR to interoperate with those VoIP devices, users need to specify which
remote VoIP devices uses IMTC conforming DTMF relay technique. Refer to CLI
command Error! Reference source not found. on Chapter 8 for detailed
information on how to select DTMF relay mode.
8.7 Voice Codecs
Voice codecs supported by the TVP-224HR include G.711, G.723.1 5.3kbps,
G.723.1 6.3kbps and G.729 AB. When setting up a call, two VoIP Gateways
automatically negotiate with each other until an agreement on codec is
determined.