Matrix Telecom SARVAM UMG System Manual page 709

If for a SIP Trunk, you have enabled Fallback Server and Registration Behavior is set to Register with
all Servers, the SIP Trunk Status page will display status of all the servers for that SIP Trunk as shown
below.
MWI Status
If you have subscribed for Message Wait Indication service from your ITSP, you can view the status of the
messages received on the SIP Trunk.
The following status indications will appear for the MWI subscription on SIP Trunks.
• Subscription Status: This displays the MWI Subscription Status. The possible status indications that will
be displayed in this column for the respective SIP Trunk numbers are described in the table below.
Status Message
Active
Active
Corresponding
4xx/5xx/6xx
response along
with the text of the
error message as it
is received with
4xx/5xx/6xx
response.
703
Description
When 200 OK with Event as message-summary and Subscription-State as active
is received against SUBSCRIBE for MWI sent from SIP Trunk.
When the NOTIFY with the Event header field as message-summary,
Subscription-State as active and the Message Body containing current status of
the pending messages, is received on SIP Trunk.
When any 4xx/5xx/6xx response is received against the SUBSCRIBE for MWI
sent from SIP Trunk.
Matrix SARVAM UMG System Manual