Welltech WG2504 FXS V.4.02 - Manual (Page 34)

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4-2 Audio
Figure 4-2 Audio setting
 Codec 1~5: The preferred codec priority
 G.711u Payload Size: G.711 u-Law payload size
 G.711a Payload Size: G.711 A-law payload size
 G.729 Payload Size: G.729A payload size
 G.723.1 Payload Size: G.723.1 payload size
 Bit Rate: G.723.1 bit rate used
 5.3K bit rate is used
 6.3K bit rate is used
 Codec Priority: Selection order to match the remote SDP for codec
selection.
Local SDP Order: Use local SDP order to match codec
Remote SDP Order: Use Remote SDP order to match codec
 DTMF Relay:
In-Band DTMF: use inband DTMF instead of out of band.
RFC 2833(fall back to SIP-INFO): Use RFC 2833 if the SDP
negotiation could be done. Or use SIP INFO for DTMF relay.
SIP INFO: Use SIP-INFO DTMF relay
RFC 2833(fall back to Inband): Use RFC 2833 if the SDP
negotiation could be done. Or use inband DTMF transmission.