Source note · SIP ALG problems on firewalls and routers
Cisco recommends turning off SIP ALG or similar SIP-aware functionality on routers and firewalls in the path of Webex Calling traffic.
Checked 2026-09-25
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 requirements
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Port Reference Information for Webex Calling — Cisco Systems, Inc. (help.webex.com) · tier 2 current vendor documentation · section 'SIP Application Layer Gateway'
Cite this note
APA
WarmTransfer. (2026, September 25). SIP ALG problems on firewalls and routers: source note sip-alg-problems-webex-recommends-off. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-alg-problems-webex-recommends-off
BibTeX
@misc{warmtransfer-claim-sip-alg-problems-webex-recommends-off,
title = {SIP ALG problems on firewalls and routers: source note sip-alg-problems-webex-recommends-off},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-alg-problems-webex-recommends-off},
note = {Source note sip-alg-problems-webex-recommends-off, checked 2026-09-25}
}