ATL Telecom IP300S - Manual (Page 74)

IP SIP Phone v2 User’s Guide Mar. 2005
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12. Service
12.1. Voice Mail
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.
IP SIP Phone supports messages waiting indication as per RFC3842. It accepts NOTIFY
messages with or without prior SUBSCRIBE.
z MWI Subscription
If you have configured the voice mailbox link, IP SIP 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]
Event: message-summary
Accept: application/simple-message-summary
Expires: 3600
User-Agent: SIP-Phone /1.1
Content-Length: 0
SIP/2.0 202 Accepted
Via: SIP/2.0/UDP 192.168.3.50
Record-Route: <sip:192.168.3.1;lr=1>
Contact: sip:192.168.3.1:6060
Expires: 3600
User-Agent: ABS GW v5.1.0
To: John <sip:[email protected]>;tag=980765
From: John <sip:[email protected]>;tag= 17542c1
Call-ID: [email protected]
CSeq: 281 SUBSCRIBE
Content-Length: 0
z Out-of-Dialog MWI Notification
IP SIP Phone accepts unsolicited MWI NOTIFIY messages as well. The sample
NOTIFY message is as follows (suppose “sip.isp.com” is one of your active service
domains and your SIP AoR is sip:[email protected]):
NOTIFY sip:[email protected] SIP/2.0
Via: SIP/2.0/udp 192.168.0.1;branch=z9hG4bKcfb4
Content-Type: application/simple-message-summary