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initial attempt (#77)

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* initial attempt

* fix: special handling on uas dialog
This commit is contained in:
Dave Horton
2023-02-21 14:00:36 -05:00
committed by GitHub
parent 7c10e98a66
commit 2ce24659ca
1 changed files with 61 additions and 9 deletions
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70
lib/call-session.js
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@@ -426,6 +426,12 @@ class CallSession extends Emitter {
// default forwarding of other request types
forwardInDialogRequests(uas, ['notify', 'options', 'message']);
// we need special handling for invite with null sdp followed by 3pcc re-invite
if (uas.local.sdp.includes('a=recvonly') || uas.local.sdp.includes('a=inactive')) {
this.logger.info('incoming call is recvonly or inactive, waiting for re-invite');
this._recvonly = true;
}
}
async _onDTMF(dlg, payload) {
@@ -528,24 +534,70 @@ Duration=${payload.duration} `
}
async _onReinvite(dlg, req, res) {
const fromTag = dlg.type === 'uas' ? this.rtpEngineOpts.uas.tag : this.rtpEngineOpts.uac.tag;
const toTag = dlg.type === 'uas' ? this.rtpEngineOpts.uac.tag : this.rtpEngineOpts.uas.tag;
const reason = req.get('X-Reason');
const isReleasingMedia = reason && dlg.type === 'uac' && ['release-media', 'anchor-media'].includes(reason);
const offerMedia = dlg.type === 'uas' ? this.rtpEngineOpts.uac.mediaOpts : this.rtpEngineOpts.uas.mediaOpts;
const answerMedia = dlg.type === 'uas' ? this.rtpEngineOpts.uas.mediaOpts : this.rtpEngineOpts.uac.mediaOpts;
const direction = dlg.type === 'uas' ? ['public', 'private'] : ['private', 'public'];
try {
/* check for re-invite with no SDP -- seen that from BT when they provide UUI info */
if (!req.body) {
this.logger.info('got a reINVITE with no SDP; just respond with our current offer');
res.send(200, {body: dlg.local.sdp});
if (dlg.type === 'uas' && this._recvonly) {
/* seen this from Broadworks - initial INVITE has no SDP, then reINVITE with SDP */
this._recvonly = false; //one-time only
const myMungedSdp = dlg.local.sdp.replace('a=recvonly', 'a=sendrecv').replace('a=inactive', 'a=sendrecv');
this.logger.info({myMungedSdp}, '_onReinvite (3gpp): got a reINVITE with no SDP while in recvonly mode');
res.send(200,
{
body: myMungedSdp
},
(err, req) => {},
async(ack) => {
const remoteOffer = ack.body;
this.logger.info({remoteOffer}, '_onReinvite (3gpp): got ACK for reINVITE with SDP');
let opts = {
...this.rtpEngineOpts.common,
...offerMedia,
'from-tag': fromTag,
'to-tag': toTag,
direction,
sdp: remoteOffer,
};
let response = await this.offer(opts);
if ('ok' !== response.result) {
res.send(488);
throw new Error(`_onReinvite (3gpp): rtpengine failed: offer: ${JSON.stringify(response)}`);
}
this.logger.info({response}, '_onReinvite (3gpp): response from rtpengine for offer');
const fsSdp = await dlg.other.modify(response.sdp);
opts = {
...this.rtpEngineOpts.common,
...answerMedia,
'from-tag': fromTag,
'to-tag': toTag,
sdp: fsSdp
};
response = await this.answer(opts);
if ('ok' !== response.result) {
res.send(488);
throw new Error(`_onReinvite(3gpp): rtpengine failed answer: ${JSON.stringify(response)}`);
}
}
);
}
else {
this.logger.info('got a reINVITE with no SDP; just respond with our current offer');
res.send(200, {body: dlg.local.sdp});
}
return;
}
const offeredSdp = Array.isArray(req.payload) && req.payload.length > 1 ?
req.payload.find((p) => p.type === 'application/sdp').content :
req.body;
const reason = req.get('X-Reason');
const isReleasingMedia = reason && dlg.type === 'uac' && ['release-media', 'anchor-media'].includes(reason);
const fromTag = dlg.type === 'uas' ? this.rtpEngineOpts.uas.tag : this.rtpEngineOpts.uac.tag;
const toTag = dlg.type === 'uas' ? this.rtpEngineOpts.uac.tag : this.rtpEngineOpts.uas.tag;
const offerMedia = dlg.type === 'uas' ? this.rtpEngineOpts.uac.mediaOpts : this.rtpEngineOpts.uas.mediaOpts;
const answerMedia = dlg.type === 'uas' ? this.rtpEngineOpts.uas.mediaOpts : this.rtpEngineOpts.uac.mediaOpts;
const direction = dlg.type === 'uas' ? ['public', 'private'] : ['private', 'public'];
if (isReleasingMedia) {
if (!offerMedia.flags.includes('asymmetric')) offerMedia.flags.push('asymmetric');
offerMedia.flags = offerMedia.flags.filter((f) => f !== 'media handover');