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Update call-session.js

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Sam Machin
2026-07-29 10:42:12 +01:00
parent 389c65e2d8
commit b356e893c0
1 changed files with 26 additions and 0 deletions
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lib/session/call-session.js
+26
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@@ -1779,6 +1779,32 @@ class CallSession extends Emitter {
this.logger.info('CallSession:_lccDtmf - invalid command as we do not have a stable call');
return;
}
/* Prefer media-path DTMF: have the media server generate RFC 2833 tones directly into the
* media stream (via send_dtmf), which the SBC/rtpengine simply forwards. This is reliable
* regardless of whether rtpengine is transcoding the call. Sending SIP INFO to the SBC
* instead relies on rtpengine 'play DTMF' injection, which silently no-ops on calls that
* are not being transcoded (rtpengine has no DSP to synthesize the tone into). We fall back
* to SIP INFO only when we have no endpoint in the media path for the targeted leg, e.g. when
* media has been released to the SBC.
* this.ep is the endpoint facing the caller (A) leg; this.currentTask.ep is the endpoint
* facing the dialed (B) leg.
*/
const ep = callSid === this.callSid ? this.ep : this.currentTask?.ep;
if (ep?.connected) {
try {
this.logger.debug(`CallSession:_lccDtmf - sending ${digit}@${duration} via send_dtmf on ${ep.uuid}`);
await ep.execute('send_dtmf', `${digit}@${duration}`);
return;
} catch (err) {
this.logger.error({err},
'CallSession:_lccDtmf - error sending DTMF via send_dtmf, falling back to SIP INFO');
}
}
/* fallback: signal the SBC to inject DTMF via SIP INFO (used when media is released
* and we have no endpoint in the media path for the targeted leg)
*/
try {
const dlg = callSid === this.callSid ? this.dlg : this.currentTask.dlg;
const res = await dlg.request({