PLANET VIP-350PT - Manual (Page 122)

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Service
Configure the external services available to the phone.
[Back] Return without any changes.
【 OK】 Edit selected item.
【 ↑】and【↓】 Navigate through items.
1 . M W I
2 . M e s s a g e
3 . S N T P
4 . A u t o - P r o v i s i o n
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MWI
Voice mail allows you to access messages left by callers when you are unavailable to take their call.
Voice mail is an optional feature configured by your system administrator. Your particular phone setup
might not support accessing voice mail in this way.
To configure the voice mailbox number to dial when the message waiting indication button, 【MWI】, is
pressed, click the “Contacts” on the right panel to pick an entry from your address book; and delete the
number in input text area to remove it.
The corresponding MWI LED will be flashing whenever it receives NOTIFY messages stipulating some
new unread (new) voice messages in your voice mailbox. To access voice mail, press the 【MWI】
button and follow the voice instructions.
The IP Phone supports messages waiting indication as per RFC3842. It accepts NOTIFY messages
with or without prior SUBSCRIBE
• MWI Subscription
If you have configured the voice mailbox link, the IP Phone will SUBSCRIBE to this link by
sending the SUBSCRIBE message to SIP server. Please refer to the following message flow
(suppose your SIP AoR is sip:[email protected] and the voice mailbox you configured is
sip:[email protected]):
SUBSCRIBE sip:[email protected] SIP/2.0
Via: SIP/2.0/UDP 192.168.3.50
From: John <sip:[email protected]>;tag= 17542c1
To: John <sip:[email protected]>
Call-ID: [email protected]
CSeq: 281 SUBSCRIBE
Contact: sip:[email protected]
Í
Note
By http://pentest.tele-consulting.com/advisories/05_07_06_voip-phones.txt , there
is a weakness of unsolicited NOTIFY for MWI. You may turn off unsolicited MWI
NOTIFY, thus effectively disable “Out-of-Dialog MWI Notification”.