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Fix: Feature server REFER #90

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merged 3 commits into from
Aug 20, 2023
Merged

Fix: Feature server REFER #90

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63b47a2
Update _onFeatureServerTransfer to fix REFER case
Jun 2, 2023
2aab0ab
Avoid remote re-invite by using port latching
Aug 17, 2023
d755e41
Add INFO listener and pretend we're a uas
Aug 17, 2023
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39 changes: 21 additions & 18 deletions lib/call-session.js
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Original file line number Diff line number Diff line change
Expand Up @@ -907,35 +907,38 @@ Duration=${payload.duration} `
...(req.has('X-Retain-Call-Sid') && {'X-Retain-Call-Sid': req.get('X-Retain-Call-Sid')}),
...(req.has('X-Account-Sid') && {'X-Account-Sid': req.get('X-Account-Sid')})
};
const dlg = await this.srf.createUAC(referTo.uri, {localSdp: dlg.local.sdp, headers});
this.uas = dlg;
this.uas.other = this.uac;
this.uac.other = this.uas;
this.uas.on('modify', this._onReinvite.bind(this, this.uas));
this.uas.on('refer', this._onFeatureServerTransfer.bind(this, this.uas));
this.uas.on('destroy', () => {

const uac = await this.srf.createUAC(referTo.uri, {localSdp: dlg.local.sdp, headers});
this.uas = uac;
uac.type = 'uas';
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interesting, 'createUAC' does not do this?

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Are you referring to setting type?

We start with this scenario:

FS1 -> UAS (SBC) UAC -> End point

When the refer takes place we end up with:

FS2 <- UAC (SBC) UAC -> End point

Quite a few tests in the call-session check (uac|uas).type to handle things like INFO frames correctly, in my case startCallRecording. As the leg to FS2 is now a UAC we need to "correct" it so things are handled in the right way.

Hopefully that shouldn't cause a problem?

uac.other = this.uac;
this.uac.other = uac;
uac.on('info', this._onInfo.bind(this, uac));
uac.on('modify', this._onReinvite.bind(this, uac));
uac.on('refer', this._onFeatureServerTransfer.bind(this, uac));
uac.on('destroy', () => {
this.logger.info('call ended with normal termination');
this.rtpEngineResource.destroy();
this.activeCallIds.delete(this.req.get('Call-ID'));
if (this.activeCallIds.size === 0) this.idleEmitter.emit('idle');
this.uas.other.destroy();
uac.other.destroy();
this.srf.endSession(this.req);
});

// modify rtpengine to stream to new feature server
let response = await this.offer(Object.assign(this.rtpEngineOpts.offer, {sdp: this.uas.remote.sdp}));
if ('ok' !== response.result) {
throw new Error(`_onReinvite: rtpengine failed: offer: ${JSON.stringify(response)}`);
}
const sdp = await this.uas.other.modify(response.sdp);
const opts = Object.assign({sdp, 'to-tag': res.getParsedHeader('To').params.tag},
this.rtpEngineOpts.answer);
response = await this.answer(opts);
const opts = {
...this.rtpEngineOpts.common,
'from-tag': this.rtpEngineOpts.uas.tag,
sdp: uac.remote.sdp,
flags: ['port latching']
};
const response = await this.offer(opts);
if ('ok' !== response.result) {
throw new Error(`_onReinvite: rtpengine failed: ${JSON.stringify(response)}`);
throw new Error(`_onFeatureServerTransfer: rtpengine offer failed: ${JSON.stringify(response)}`);
}
dlg.destroy().catch(() => {});
this.logger.info('successfully moved call to new feature server');
} catch (err) {
res.send(488);
this.logger.error(err, 'Error handling refer from feature server');
}
}
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