Cisco Systems SPA9000 manual How Voicemail Works

Advanced Topics in SPA9000 Administration

Advanced Topics for SPA400 Voice Mail Service

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How Voicemail Works

When a user checks voicemail from a client station, the SPA9000 sends an INVITE on its behalf to the configured <Mailbox Manage URL>. For example:

INVITE sip:mailbox-manage-url SIP/2.0

Via: SIP/2.0/UDP 192.168.2.205:5060;branch=z9hG4bK- 171eb6b5

From:

<sip:37683102@sip.myitsp.com>;tag=300704dd2590d20bo2;ref=5

031;mbid=53371

To: <sip:mailbox-manage-url>

Call-ID: 58a2b2c5-66e2bd43@192.168.2.205

CSeq: 101 INVITE

Max-Forwards: 70

Contact: <sip:37683102@192.168.2.205:5060>

Here the client station is at extension 5031 and the mailbox ID is 53371. The voicemail server should then prompt the caller to enter a PIN and access the voicemail features for the given mailbox.

A user should also be able to call an external number explicitly from anywhere to retrieve voice mail messages. When the voicemail server receives such a call, it should prompt the caller to enter the mailbox ID and then the PIN number. If the user-ID of the voicemail account cannot be uniquely identified from the mailbox ID or from the called number, the server must first prompt the user to enter the user- ID before proceeding.

NOTE If an EXT-To-DID mapping exists for the calling extension on the line interface, the user-ID and display name fields of the FROM header are replaced by the mapped DID number and the display name assigned to the phone, respectively. In this case, a DIVERSION header similar to the REFERRED-BY header is also included.

SPA9000 Voice System Administration Guide 179