Cisco Expressway Administrator Guide (X15.4) - Protocols

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/admin_guide/X15-4/exwy_b_cisco-expressway-administrator-guide-x154/exwy_m_protocols.html

Published

2026-02-09

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

• With the default Registered only mode, a B2B call between a Unified CM SIP user and an external H.323-only system through Expressways with no locally registered endpoint would probably not be interworked unless the mode is changed to On. inferred in context
• The default H.323-SIP interworking mode is Registered only, and Cisco recommends leaving it at that setting. in context
• The Expressway's H.323-SIP interworking mode can be Off, Registered only (interwork only if at least one endpoint is locally registered) or On (interwork regardless of registration). in context
• In the X15.4 SIP protocol configuration the default transport modes are UDP Off, TCP Off, TLS On and Mutual TLS Off. in context

Cite this source record

APA

WarmTransfer. (2026, February 9). Cisco Expressway Administrator Guide (X15.4) - Protocols. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-exwy-admin-x154-protocols

BibTeX

@misc{warmtransfer-cisco-exwy-admin-x154-protocols,
  title  = {Cisco Expressway Administrator Guide (X15.4) - Protocols},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-exwy-admin-x154-protocols},
  note   = {Cisco Systems, accessed 2026-09-25}
}