Refer to the exhibit. Some calls fail to connect after an engineer implements load balancing for a Cisco Meeting Server cluster. The engineer determines that if a call leaves Cisco UCM using the…

Refer to the exhibit. Some calls fail to connect after an engineer implements load balancing for a Cisco Meeting Server cluster. The engineer determines that if a call leaves Cisco UCM using the Cisco Meeting Server 1 SIP trunk, but the conference is already hosted on Cisco Meeting Server 2, then the call fails. If the call leaves Cisco UCM using the Cisco Meeting Server 2 SIP trunk, but the conference is already hosted on Cisco Meeting Server 1, then the call fails. What is the cause of the issue? outgoing SIP TLS data to 10.0.101.111:5061 from 10.0.101.121:43332, size 5430:

BEGINNING OF MESSAGE INVITE sip:[email protected] SIP/2.0 Via: SIP/2.0/TLS 10.0.101.121:5061;branch=z9hG4bK6e7932e8ae287a80ee699eb04a6155a2 Call-ID: cf600c54-974c-48e5-92e2-95b1d4b9218f CSeq: 1199885731 INVITE Max-Forwards: 70 Contact: sip:[email protected];transport=tls;isFocus To: sip:[email protected] From: “CCNP Collaboration” sip:[email protected];tag=73a834a850d8ed13 Replaces: [email protected];to-tag=1769141~ba2cc769- 5032-4f8f-a864-9a51 Allow: INVITE, ACK, CANCEL, OPTIONS, INFO, BYE, UPDATE, REFER, SUBSCRIBE, NOTIFY, MESSAGE Supported: timer, X-cisco-callinfo Session-Expires: 1800 Min-SE: 90 User-Agent: Acano CallBridge <SDP omitted> END OF MESSAGE incoming SIP TLS data from 10.0.101.111:5061 to 10.0.101.121:43332, size 402:

BEGINNING OF MESSAGE SIP/2.0 403 Forbidden Via: SIP/2.0/TLS 10.0.101.121:5061;branch=z9hG4bK6e7932e8ae287a80ee699eb04a6155a2 From: “CCNP Collaboration” sip:[email protected];tag=73a834a850d8ed13 To: sip:[email protected];tag=252834177 Date: Mon, 30 Nov 2020 18:25:12 GMT Call-ID: cf600c54-974c-48e5-92e2-95b1d4b9218f CSeq: 1199885731 INVITE Allow-Events: presence Server: Cisco-CUCM12.5 Content-Length: 0 END OF MESSAGE