Source note · Troubleshooting calling in the Webex App
Cisco recommends turning off SIP ALG on SIP-aware routers and firewalls for Webex Calling, because some implementations break firewall traversal.
Checked 2026-10-01
Certain SIP ALG implementations can cause issues with firewall traversal.
- Vendor
- Cisco
- Product
- Webex Calling
- Subsystem
- firewall traversal
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-10-01
- Checked
- 2026-10-01
Sources
- Port Reference Information for Webex Calling — Cisco Systems, Inc. (help.webex.com) · tier 2 current vendor documentation · SIP Application Layer Gateway section
Cite this note
APA
WarmTransfer. (2026, October 1). Troubleshooting calling in the Webex App: source note webex-app-calling-troubleshooting-sip-alg-disable. WarmTransfer. https://warmtransfer.net/knowledge/claims/webex-app-calling-troubleshooting-sip-alg-disable
BibTeX
@misc{warmtransfer-claim-webex-app-calling-troubleshooting-sip-alg-disable,
title = {Troubleshooting calling in the Webex App: source note webex-app-calling-troubleshooting-sip-alg-disable},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/webex-app-calling-troubleshooting-sip-alg-disable},
note = {Source note webex-app-calling-troubleshooting-sip-alg-disable, checked 2026-10-01}
}