Source note · CUCM to Teams Phone migration
Teams Transport Relays have two versions - v4 requiring port range 50000 to 59999 and v6 working with 3478 to 3481 - and Microsoft recommends at least two ports per concurrent call on the SBC.
Checked 2026-09-16
Microsoft recommends at least two ports per concurrent call on the SBC.
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- media ports
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-16
- Checked
- 2026-09-16
Sources
- Plan for media bypass with Direct Routing — Microsoft · tier 2 current vendor documentation · Requirements for using Transport Relays
Cite this note
APA
WarmTransfer. (2026, September 16). CUCM to Teams Phone migration: source note cucm-to-teams-phone-media-bypass-relay-ports. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-to-teams-phone-media-bypass-relay-ports
BibTeX
@misc{warmtransfer-claim-cucm-to-teams-phone-media-bypass-relay-ports,
title = {CUCM to Teams Phone migration: source note cucm-to-teams-phone-media-bypass-relay-ports},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-to-teams-phone-media-bypass-relay-ports},
note = {Source note cucm-to-teams-phone-media-bypass-relay-ports, checked 2026-09-16}
}