Source note · SIP ALG problems on firewalls and routers
Fortinet's 2015 technical tip says the FortiGate SIP ALG should be disabled only for troubleshooting, to isolate a problem. Cisco instead recommends switching SIP ALG off for Webex Calling as standing practice.
disputed · Checked 2026-09-25
Disabling the SIP-ALG should only be done for troubleshooting (to isolate a problem).
- Vendor
- Fortinet
- Product
- FortiGate (FortiOS)
- Subsystem
- VoIP inspection
- Deployment
- on-premises
- Region
- not restricted
- Release range
- FortiOS 5.x era per 2015 tip
- Status
- disputed
- Checked
- 2026-09-25
Sources
- Technical Tip: Disabling VoIP Inspection — Fortinet (Fortinet Community technical tip authored by Fortinet staff) · tier 2 current vendor documentation · warning notes
Cite this note
APA
WarmTransfer. (2026, September 25). SIP ALG problems on firewalls and routers: source note sip-alg-problems-fortigate-troubleshoot-only. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-alg-problems-fortigate-troubleshoot-only
BibTeX
@misc{warmtransfer-claim-sip-alg-problems-fortigate-troubleshoot-only,
title = {SIP ALG problems on firewalls and routers: source note sip-alg-problems-fortigate-troubleshoot-only},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-alg-problems-fortigate-troubleshoot-only},
note = {Source note sip-alg-problems-fortigate-troubleshoot-only, checked 2026-09-25}
}