MS Teams 491 Issue when ANCHOR_MEDIA_ALWAYS is set to false.

[ajukes]

For some MS Teams tenants, when making a call from teams, we see the following error. Setting ANCHOR_MEDIA_ALWAYS to true is a workaround.

Seen on v0.9.0

{
	"level": 30,
	"time": 1720175205592,
	"pid": 104402,
	"hostname": "ip-172-31-1-XXX",
	"callId": "eb2b7618-b55b-123d-44bc-XXX",
	"callSid": "23df5a3d-cc26-4246-837a-XXX",
	"accountSid": "6e3e2f88-c66b-4c25-XXX",
	"callingNumber": "+441313XXXXXX",
	"calledNumber": "+443456XXXXXX",
	"traceId": "f94453a4a4d3aa5b493b4ffccaXXXX",
	"err": {
		"type": "SipError",
		"message": "Sip non-success response: 491",
		"stack": "SipError: Sip non-success response: 491\n    at Request.<anonymous> (/home/admin/apps/jambonz-feature-server/node_modules/drachtio-srf/lib/dialog.js:363:26)\n    at Request.emit (node:events:519:28)\n    at DrachtioAgent._onMsg (/home/admin/apps/jambonz-feature-server/node_modules/drachtio-srf/lib/drachtio-agent.js:690:22)\n    at WireProtocol.emit (node:events:519:28)\n    at WireProtocol.processMessageBuffer (/home/admin/apps/jambonz-feature-server/node_modules/drachtio-srf/lib/wire-protocol.js:293:12)\n    at WireProtocol._onData (/home/admin/apps/jambonz-feature-server/node_modules/drachtio-srf/lib/wire-protocol.js:326:14)\n    at Socket.emit (node:events:519:28)\n    at addChunk (node:internal/streams/readable:559:12)\n    at readableAddChunkPushByteMode (node:internal/streams/readable:510:3)\n    at Readable.push (node:internal/streams/readable:390:5)",
		"name": "SipError",
		"status": 491,
		"reason": "Request Pending"
	},
	"msg": "Dial:_releaseMedia error"
}