Call issue

[msabat]

Hello.

I try to route call from Teams to Cisco TelePresence. Route is fine. In call I reach Cisco TelePresence correctly, I hear welcome message but after that call is disconnected.

I see that issue on SBC:

05:29:31.000 ---- Incoming SIP Message from 52.114.132.46:9728 to SIPInterface #1 (Teams) TLS TO(#160) SocketID(374022) ---- [Time:27-07@05:29:31.137]

SIP/2.0 488 Not Acceptable Here

FROM: <sip:+19995550118@sxsbc1.qg.com:5061;user=phone>;tag=39559345~43deca70-8680-4d84-9d07-93c553f67090-36911004

TO: "Sabat, Michal"<sip:+14145668769@sip.pstnhub.microsoft.com:5061;user=phone>;tag=6e609738eadb4f1ba2e599116fa0cb6a

CSEQ: 3 INVITE

CALL-ID: 85391d0fad8054ff8c02e5e71ec57b92

VIA: SIP/2.0/TLS sxsbc1.qg.com:5061;branch=z9hG4bKac1774153124

REASON: Q.850;cause=79;text="6ce84b5c-aa0a-4b12-ba82-5c662a807926;InternalDiagCode: InvalidNumberOfMedia, InternalErrorPhrase: Incorrect number of media streams in SDP offer"

CONTACT: <sip:api-du-a-euno.pstnhub.microsoft.com:443;x-i=6ce84b5c-aa0a-4b12-ba82-5c662a807926;x-c=85391d0fad8054ff8c02e5e71ec57b92/d/8/4e34278e2ec843bdae4c1e43ebfbeab7>

CONTENT-LENGTH: 0

ALLOW: INVITE,ACK,OPTIONS,CANCEL,BYE,NOTIFY

SERVER: Microsoft.PSTNHub.SIPProxy v.2020.7.17.8 i.USEA.8

[#2]

Any idea?

[#3 · Accepted solution]

@msabat I found that in logs:

Teams proxy 52.x.x.x rejects the call with 488 as shown below from the trace. Why Teams is sending a 488? I do not see an issue with the coders that are offered, DTMF, or other common reason we may see a rejection from Microsoft.

[#4]

Did you find a solution for this?@msabat 

[#5]

i faced this issue before, i found that
### the trunk from teams has the following:
-mediaBypass $false
-BypassMode $true
###on Gateway ICE-Lite is enabled
Solution:
make -MediaBypass True

ensure that if you enabled ICE-lite on the gateway, enable the media Bypass on Teams, to allow the candidate to be sent from teams