Migrating Poly Phones from Microsoft 3PIP Gateway and RPRM to Teams SIP Gateway and Lens
Migration Considerations
There will be 4 main types of phones connected to 3PIP gateway. You will need to consider these phone use cases, and the phone features required to determine if you will need to migrate the 3PIP phone to Teams SIP gateway or replace it with a native Teams solution.
| Phone Use Cases | Base Requirements | Recommendation | 
|---|---|---|
| Common Area Phone | This is an IT controlled device sign-in that just needs basic calling features. | Migrate existing 3PIP phones to Teams SIP Gateway. Follow this guide to help you plan the migration of these phones. | 
| User Phone or Boss/Admin | Requires logging into the phone with their own user account and require advance call handling, calendar join and conference features. | Replace phone with a Native Teams IP Phone like Poly CCX 400, 500 or 600. Teams SIP Gateway will have limited feature set and not suitable for these users. | 
| Conference Phone (Audio Only) | This is an IT controlled device sign-in that require advance call handling, calendar join and conference features. | If users need calendar join and advance conference features, replace phone with a Native Teams IP conference phone like Poly Trio C60. If users just need basic dialing, migrate existing Trio 8500/8800 to Teams SIP Gateway. | 
| Conference Phone (Video) | This is an IT controlled Trio with Visual+ or Visual Pro configured for basic dialing, calendar join, hybrid registration to Real Connect for Video. | Teams SIP Gateway does not support hybrid registration, advanced dial plan configurations, or video enablement. We recommend for video scenarios to migrate to either a certified Microsoft Teams Room on Android or Microsoft Teams Room on Windows". | 
Teams SIP Gateway Feature Comparison
| Features | Teams SIP Gateway | 3PIP Gateway | Teams IP Phone (Native) | 
|---|---|---|---|
| Poly Models Supported | VVX, Trio 8500/8800 & CCX500 | VVX, Trio 8500/8800 & CCX500 | CCX 400/500/600 & Trio C60 | 
| Sign-In | Phone Web Sign-in or TAC Remote Web Sign-in | Phone Web Sign-in or TAC Remote Web Sign-in | Phone & Web Sign-In | 
| Calling Functions - Send/Receive Calls - Hold / Resume - Blind / Consult Transfer / Forward - DND / Mute | Supported | Supported | Supported | 
| Merge Call / Promote to Conference | Local Conference Only | Supported | Supported | 
| Voicemail + MWI | Supported | Supported | Supported | 
| Presence | - | Supported | Supported | 
| Directory Search | Optional: LDAP Integration | Supported | Supported | 
| Contacts / Favorite | Optional: Local Contacts | Supported | Supported | 
| Calendar Join | Manual dial to Audio Conf | Supported | Supported | 
| Boss / Admin | - | Supported | Supported | 
| Boss / Admin | - | Supported | Supported | 
| Hot Desking | - | - | Supported | 
| Walkie Talkie (paging) | Poly Group Paging | Poly Group Paging | Supported | 
| Advance Conference Controls | - | - | Supported | 
| Response Groups | - | - | Supported | 
| Better Together | - | - | Supported | 
| Teams Failover | - | - | Supported | 
| E911 Support | Static emergency calling and location support | Static emergency calling and location support | Supported | 
| CAP Accounts | Supported | Supported | Supported | 
| Support for Hybrid Registration | Not Supported | UCS Hybrid Registration | UCS Call application Switching | 
| Centralized Management | Poly Lens + Teams Admin Center | Poly Lens, Poly RPRM or PDMS-E | Poly Lens + Teams Admin Center | 
| PSTN connectivity for Teams Account | Must be Configured | Optional | Optional | 
Note: Not all VVXs are supported. Please refer to Microsoft’s list of compatible devices for Teams SIP Gateway.
Migration Overview
This is an overview of the migration steps for the 3PIP phones to Teams SIP Gateway with basic calling features. While the steps will directly work through the process when using Poly Resource Manager (RPRM) as your current provisioning service, these steps could be replicated against any third part provisioning service.
Expected Environment Starting State: 3PIP Poly phones are being directed to your provisioning server (RPRM or other) where they are configured for Skype base profile and logged in with a Teams account registered to the 3PIP Gateway.

You will create (or leverage an existing) Poly Lens Account which will be the final configuration and management platform for your devices. To get the devices there, you will first clear the local configuration on the phone via RPRM, signing them out of the 3PIP service and then you will re-direct the phones via configuration. Once migrated to Lens, Lens will configure the Poly phone via Teams SIP Gateway integration and apply a combined phone configuration from Microsoft and additional phone policies you’ve set on Lens.
You will use web sign-in on the phone or TAC remote sign-in to register the phone with a Teams account configured for PSTN.

Once you have existing 3PIP phones migrated to Lens and registered to Teams SIP Gateway, you’ll change the DHCP Option 161/66 setting on to point phones to your Lens provisioning. Even if you factory reset an migrated 3PIP phone, the DHCP server will re-configure it as a new phone and apply the device policy for Teams SIP Gateway. Once the DHCP Scope has been reconfigured, you can decommission your RPRM (or 3rd Party Provisioning Service).