H.323 endpoint and SIP endpoint with a dual registered extension support multiple simultaneous active calls.
H.323 SBA for OPS call
H.323 deskphones support simulated bridged appearance for OPS calls. When a SIP endpoint is active on a call, H.323 desk telephone shows the call as a simulated bridge appearance. The H.323 telephone can bridge onto the call by selecting the simulated bridge appearance. The system does not support bridging if Exclusion is active.
SIP SBA for H.323 call
When an H.323 deskphone is active on a call, the SIP telephone displays the call as a simulated bridge appearance. The H.323 telephone can bridge onto the call by selecting the simulated bridge appearance. The system does not support bridging if Exclusion is active.
Call forward busy and Call coverage busy
A dual registered extension supports Call forward busy and Call coverage busy, regardless of which type of endpoint is busy.
Direct media
H.323 endpoint and SIP endpoint with a dual registered extension support direct media. Communication Manager uses initial direct media for a call involving a dual registered extension if all endpoints involved in the call are administered for Direct Media.
Mismatched number of buttons
The system lets the SIP and H.323 endpoints have a different number of buttons from each other. For example, the H.323 endpoint may support 24 buttons, but the SIP endpoint may be a conference phone that supports only a few buttons.
Automatic call back
You can activate automatic call back only from an H.323 endpoint. However, the feature works as expected on the dual registered extension.
Barge-in tone
The system supports this feature on a dual registered extension. If you set the off-pbx-telephone configuration-set, Barge-in Tone field to y, Communication Manager plays a tone when the other endpoint with the same extension number bridges onto an already active call.
Multiple calls and breaking in to a call
When a SIP endpoint and an H.323 endpoint with a dual registered extension are simultaneously active on independent calls, another endpoint can use one of the following features to break in to the call:
Service observing
Whisper page
Intrusion
Busy Verification
Limit Number of Concurrent Calls
The system supports the LNCC feature on dual registered endpoints. When you activate Limit Number of Concurrent Calls (LNCC) by using the FAC or by pressing the limit-call button on the H.323 deskphone, the LNCC feature limits the number of calls ringing at the extension even when the extension is using an OPTIM application.
Automatic hold
The system supports automatic hold on a dual registered extension.
Bridged appearance
SIP and H.323 endpoints with a dual registered extension can use multiline bridged appearance to originate, answer, and bridge on to calls to or from another telephone.
Busy-verify
SIP and H.323 endpoints with a dual registered extension support the Busy-verification feature.
Extend-call
SIP and H.323 endpoints with a dual registered extension can extend calls to other telephones.
Network failure
In a network connectivity failure, calls between SIP and H.323 phones with a dual registered extension remain active. Endpoints display bridge appearances after connection recovery.
Third Party Send All Calls
SIP and H.323 endpoints with a dual registered extension can send calls to a third party extension.
Third Party Enhanced Call Forwarding
SIP and H.323 endpoints registered with the same extension can forward incoming calls to different destinations depending on whether they are from internal or external sources.
Message Waiting Indicator (MWI)
H.323 and SIP endpoints support Message Waiting Indicator (MWI) for read and unread voice messages.
Multiple Device Access
Multiple Device Access (MDA) lets you register several SIP endpoints to the same extension. MDA is not supported together with Dual Registration, because a Dual Registration endpoint must be configured in System Manager using an H.323 endpoint type.
