Source note · Setting up third-party SIP phones on Webex Calling
Cisco recommends turning off SIP Application Layer Gateway or similar SIP-aware functionality on routers and firewalls in the path to Webex Calling.
Checked 2026-09-30
If a router or firewall is SIP Aware, implying that the SIP Application Layer Gateway (ALG) or similar is enabled, we recommend you turn off this functionality for accurate operation of the service.
- Vendor
- Cisco
- Product
- Webex Calling
- Subsystem
- network
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-30
- Checked
- 2026-09-30
Sources
- Port Reference Information for Webex Calling — Cisco · tier 2 current vendor documentation · section 'Firewall configuration', SIP Application Layer Gateway paragraph
Cite this note
APA
WarmTransfer. (2026, September 30). Setting up third-party SIP phones on Webex Calling: source note webex-calling-third-party-phone-setup-sip-alg. WarmTransfer. https://warmtransfer.net/knowledge/claims/webex-calling-third-party-phone-setup-sip-alg
BibTeX
@misc{warmtransfer-claim-webex-calling-third-party-phone-setup-sip-alg,
title = {Setting up third-party SIP phones on Webex Calling: source note webex-calling-third-party-phone-setup-sip-alg},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/webex-calling-third-party-phone-setup-sip-alg},
note = {Source note webex-calling-third-party-phone-setup-sip-alg, checked 2026-09-30}
}