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New Member

Changing DTMF to Out-of Band for ATA using SIP

How to change the AudioMode to get out-of-band DTMF?

The Audio Mode format: default format is 0x00150015.

Where 0015 0015 are the same audio settings for phone 1 and 2. My AS5300 "call history voice" shows a sipv2 call with inband DTMF.

"ATA parameters and settings" says:

bit 0 (mask 0x1): G.711SilenceSuppress: enable G.711 silent suppression (1)

bit 1 (mask 0x2): G.711Only: use G.711 only; do not use the low-bit-rate codec (0)

bit 2 (mask 0x4): FaxDetCED: enable fax CED tone detection (1)

bit 3 (mask 0x8): FaxDetCNG: enable fax CNG tone detection (0)

bits 4-5 (mask 0x30): DtmfMethod:

0=always inband (send and receive; don't send SDP info)

1=by negotiation (send SDP info, enable rcv, decode others SDP info, send depends on other SDP info)

2=always out-of-band (send SDP info, enable rcv, decode other SDP info, always send) (1)

any help would be appreciated


New Member

Re: Changing DTMF to Out-of Band for ATA using SIP

0x10151015 changes bits 4-5 to value "2" OR 10 in binary where 0001 0000 0001 0101 is the new setting

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