Retrieving VM

Chapter 2 SIP Subscribers

Cisco BTS 10200 Softswitch-Based Features

Whenever a change in VM status occurs for a subscriber (for example, when a VM message is deposited for the subscriber, or when all such messages have been retrieved), the VM server sends an update to the BTS 10200. If the subscriber is on a SIP phone, the BTS 10200 sends an unsolicited SIP Notify message to convey the MWI status to the phone. The number in the Notify message Request URL (which is the assigned subscriber number) identifies the subscriber.

When the BTS 10200 is congested by a flood of registrations (which might occur, for example, when power is restored to a region after an outage), it can automatically suppress the MWI indication to the registering phones, so that registration throughput is not adversely affected.

The BTS 10200 implements the draft-ietf-sipping-MWI-01.txt with the following caveat: It supports receiving unsolicited NOTIFYs from a VM system; however, it does not support subscribing to these notifications. Further, the BTS 10200 does not support subscriptions for MWI. It sends unsolicited NOTIFYs for MWI to SIP subscribers. No subscription is expected from the SIP phones for the purpose of receiving this notification.

The notification of MWI by the BTS 10200 is enabled by default (VMWI=Y in the Subscriber table). You can disable it by setting VMWI=N.

Tip For MGCP subscribers, the BTS 10200 sends the MGCP RQNT message to turn on MWI on the analog phone. This activates the MWI indicator on the subscriber phone. The indicator can be visual (a lamp, an envelope, or another icon on a display) or it can be auditory, such as a stutter dial tone that is provided when the user next goes off-hook.

For information on setting the MWI and VMWI parameters in the Subscriber table, see the “Message Waiting Indicator (MWI)—Audible and Visual” section in the Cisco BTS 10200 Softswitch Network and Feature Descriptions document.

To retrieve a VM message, subscribers dial the pilot number for the VM server. The BTS 10200 routes the call to the SIP trunk for VM, based on the provisioned dial plan for the subscriber and the route, destination, and trunk-group entries.

Once the VM message is retrieved, the VM server sends a Notify message to the BTS 10200 to turn off the MWI indicator.

Calling Back a Message Depositor

When subscribers call into a VM server, this feature allows for calling back the person who left the voice-mail message. The feature requires that a Softswitch trunk for the VM server be provisioned in the Cisco BTS 10200 Softswitch with the relevant routes, destination, and dial plans in order to admit VM-originated calls into the BTS 10200.

VM Implementation for Centrex Subscribers

For calls received on SIP VM trunks from the VM server, a subscriber is provisioned and associated as the main sub-ID for each trunk. The subscriber information represents properties of a specific Centrex group and does not represent any particular subscriber. No AOR is provisioned for this subscriber. This information is used for call processing.

	Cisco BTS 10200 Softswitch SIP Feature and Provisioning Guide, Release 5.0
2-26	OL-12397-13

OL-12397-13 specifications

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