SIP Gateway requires the firewall to be open to Microsoft 365 and Teams traffic per the Office 365 URLs and IP address ranges, with rules needed for outbound traffic only, and device http/s traffic must bypass any corporate proxy.
Checked 2026-09-30
- Vendor
- Microsoft
- Product
- Microsoft Teams Phone
- Subsystem
- SIP Gateway network
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-30
- Checked
- 2026-09-30
Sources
- Configure SIP Gateway — Microsoft · tier 2 current vendor documentation · Before you can configure SIP Gateway, firewall and proxy bullets
Cite this note
APA
WarmTransfer. (2026, September 30). Setting up SIP Gateway for Cisco and Poly phones on Teams: source note teams-sip-gateway-setup-firewall-no-proxy. WarmTransfer. https://warmtransfer.net/knowledge/claims/teams-sip-gateway-setup-firewall-no-proxy
BibTeX
@misc{warmtransfer-claim-teams-sip-gateway-setup-firewall-no-proxy,
title = {Setting up SIP Gateway for Cisco and Poly phones on Teams: source note teams-sip-gateway-setup-firewall-no-proxy},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/teams-sip-gateway-setup-firewall-no-proxy},
note = {Source note teams-sip-gateway-setup-firewall-no-proxy, checked 2026-09-30}
}