B Ranch O Ffice R Esiliency - Yealink SIP-T22 User Manual

User Guide for the SIP-T22(P) IP Phone
Branch office resiliency is critical for multi-site deployments of Microsoft Lync where the
control servers are located at a central site or data center. It allows branch site users to
continue to have Enterprise Voice service and voice mail (if voice mail rerouting settings
are configured) when the branch site loses the connection to the central site.
When the WAN connection between the branch site and central site is unavailable, the
phone goes into resiliency mode:
Branch site user on the phone stays signed in with an indication of "limited service

due to outage".
Call between branch site users is established successfully with 2-way audio.

Contact list is unavailable but you can search for a contact on the phone.

Calls can be placed from the call history on the phone.

Presence icon on the phone LCD screen is displayed as

Presence status of the user is indicated to be "Unknown" on the phone.

The user's presence cannot be changed on the phone.

Voice mail list does not get modified.

Calls on the phone can be transferred to another branch site user.

Call forward settings cannot be changed.

When the WAN connection between the branch site and central site becomes available,
the phone comes out of resiliency mode automatically. You can use phone features as
normal.
Note
For more information on branch office resiliency, contact your system administrator.
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