This script is available in sipclients package that must be installed separately from SIP SIMPLe client SDK package.
Usage: sip-subscribe-mwi [options] [firstname.lastname@example.org] 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).