If the tenant uses Conditional Access, Microsoft says to exclude the site public IP addresses and the SIP Gateway API app (app ID 0ab9de21-b802-4d77-b279-1ad41ca233b4), because SIP devices are not Intune-managed and get stricter checks.
Checked 2026-10-02
- Vendor
- Microsoft
- Product
- Microsoft Teams SIP Gateway
- Subsystem
- conditional-access
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-10-02
- Checked
- 2026-10-02
Sources
- Configure SIP Gateway — Microsoft · tier 2 current vendor documentation · Configure SIP Gateway > Configure conditional access
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting phones signing in through Teams SIP Gateway: source note teams-sip-gateway-troubleshooting-ca-exclude-ips-and-app. WarmTransfer. https://warmtransfer.net/knowledge/claims/teams-sip-gateway-troubleshooting-ca-exclude-ips-and-app
BibTeX
@misc{warmtransfer-claim-teams-sip-gateway-troubleshooting-ca-exclude-ips-and-app,
title = {Troubleshooting phones signing in through Teams SIP Gateway: source note teams-sip-gateway-troubleshooting-ca-exclude-ips-and-app},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/teams-sip-gateway-troubleshooting-ca-exclude-ips-and-app},
note = {Source note teams-sip-gateway-troubleshooting-ca-exclude-ips-and-app, checked 2026-10-02}
}