Source note · SIP ALG problems on firewalls and routers
Microsoft does not support a third-party SIP proxy or user agent server between the Microsoft SIP proxy and the paired SBC that might modify the Request-URI created by the SBC.
Checked 2026-09-25
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- SIP signaling
- Deployment
- multi-tenant, hybrid
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Teams Phone System Direct Routing: SIP protocol — Microsoft · tier 2 current vendor documentation · Processing the incoming request: finding the tenant and user, step 5
Cite this note
APA
WarmTransfer. (2026, September 25). SIP ALG problems on firewalls and routers: source note sip-alg-problems-teams-dr-no-modifying-proxy. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-alg-problems-teams-dr-no-modifying-proxy
BibTeX
@misc{warmtransfer-claim-sip-alg-problems-teams-dr-no-modifying-proxy,
title = {SIP ALG problems on firewalls and routers: source note sip-alg-problems-teams-dr-no-modifying-proxy},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-alg-problems-teams-dr-no-modifying-proxy},
note = {Source note sip-alg-problems-teams-dr-no-modifying-proxy, checked 2026-09-25}
}