Source note · SIP ALG problems on firewalls and routers
Cisco states that, although all Webex Calling traffic is encrypted, certain SIP ALG implementations can still cause firewall traversal issues.
Checked 2026-09-25
Although all Webex Calling traffic is encrypted, certain SIP ALG implementations can cause issues with firewall traversal.
- 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-encrypted-still-affected. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-alg-problems-webex-encrypted-still-affected
BibTeX
@misc{warmtransfer-claim-sip-alg-problems-webex-encrypted-still-affected,
title = {SIP ALG problems on firewalls and routers: source note sip-alg-problems-webex-encrypted-still-affected},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-alg-problems-webex-encrypted-still-affected},
note = {Source note sip-alg-problems-webex-encrypted-still-affected, checked 2026-09-25}
}