Configure Business to Business Audio/Video Calls through Expressway

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/support/docs/unified-communications/expressway/213864-configure-business-to-business-audio-and.html

Published

2024-03-06

Updated

unknown

Accessed

2026-09-25

HTTP status

200

License

Cisco website terms of use; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• For SIP/TLS between Unified CM and Expressway-C, the Expressway-C server certificate or its CA root goes into the Unified CM trust store on all servers, and the CallManager certificate or its CA root goes into Expressway-C's trusted CA list. in context
• Cisco's B2B technote has the Unified CM SIP trunk to Expressway-C listen on non-standard ports 6060 for SIP/TCP and 6061 for SIP/TLS, keeping B2B traffic apart from MRA edge traffic. in context
• For inbound SIP business-to-business calls, SRV records for SIP call routing must be created on the public DNS servers so other organisations can locate the Expressway-E. in context
• Cisco's B2B technote uses a traversal zone separate from the Unified Communications (MRA) traversal zone, on a different port such as 7003 rather than 7001. in context
• Cisco's B2B audio/video technote states minimum versions of Expressway X8.1.1 and Unified CM 10.0. in context
• The B2B technote uses a transform on Expressway-C to remove the port from the URI in INVITEs received from Unified CM. in context
• In a B2B deployment Expressway-C is the traversal client and Expressway-E is the traversal server. in context

Cite this source record

APA

WarmTransfer. (2024, March 6). Configure Business to Business Audio/Video Calls through Expressway. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-technote-213864-expressway-b2b-av-calls

BibTeX

@misc{warmtransfer-cisco-technote-213864-expressway-b2b-av-calls,
  title  = {Configure Business to Business Audio/Video Calls through Expressway},
  author = {{WarmTransfer}},
  year   = {2024},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-technote-213864-expressway-b2b-av-calls},
  note   = {Cisco Systems, accessed 2026-09-25}
}