Source note · SIP ALG problems on firewalls and routers
Palo Alto Networks states that when a VoIP client application has NAT intelligence embedded, the firewall's SIP ALG can interfere with signaling and cause the client application to stop working.
Checked 2026-09-25
- Vendor
- Palo Alto Networks
- Product
- NGFW (PAN-OS)
- Subsystem
- App-ID
- Deployment
- on-premises
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Disable the SIP Application-level Gateway (ALG) — Palo Alto Networks · tier 2 current vendor documentation · page introduction
Cite this note
APA
WarmTransfer. (2026, September 25). SIP ALG problems on firewalls and routers: source note sip-alg-problems-panos-alg-interferes. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-alg-problems-panos-alg-interferes
BibTeX
@misc{warmtransfer-claim-sip-alg-problems-panos-alg-interferes,
title = {SIP ALG problems on firewalls and routers: source note sip-alg-problems-panos-alg-interferes},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-alg-problems-panos-alg-interferes},
note = {Source note sip-alg-problems-panos-alg-interferes, checked 2026-09-25}
}