Source note · SIP ALG problems on firewalls and routers
Registration failures attributed to SIP ALG plausibly come from Contact or Via rewriting that conflicts with the endpoint's own NAT handling. The collected vendor sources state interference in general terms but do not document a registration-specific mechanism.
inferred · Checked 2026-09-25
- Vendor
- multi-vendor
- Product
- SIP through NAT
- Subsystem
- registration
- Deployment
- on-premises, multi-tenant, hybrid
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Status
- inferred
- 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-registration-failure-mechanism. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-alg-problems-registration-failure-mechanism
BibTeX
@misc{warmtransfer-claim-sip-alg-problems-registration-failure-mechanism,
title = {SIP ALG problems on firewalls and routers: source note sip-alg-problems-registration-failure-mechanism},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-alg-problems-registration-failure-mechanism},
note = {Source note sip-alg-problems-registration-failure-mechanism, checked 2026-09-25}
}