(NOTE) This script is available in [[sip_clients]] package that must be installed separately from SIP SIMPLe client SDK package.
```
Usage: sip-subscribe-mwi [options] [target-user@target-domain.com]
This script will SUBSCRIBE to the Message Summary event published for the
specified SIP target. When a NOTIFY is received with the message summary
information it will be displayed. The program will un-SUBSCRIBE and quit when
CTRL+D is pressed.
Options:
-h, --help show this help message and exit
-a ACCOUNT_NAME, --account-name=ACCOUNT_NAME
The name of the account to use.
-s, --trace-sip Dump the raw contents of incoming and outgoing SIP
messages (disabled by default).
-j, --trace-pjsip Print PJSIP logging output (disabled by default).
-n, --trace-notifications
Print all notifications (disabled by default).
```