# QSIG Description

QSIG is an international protocol that allows you to connect a minimum of two systems together to form a virtual private network. Because QSIG is an international standard, the virtual private network can benefit corporations that need to connect offices that have systems from different vendors.

QSIG supports both ETSI and ISO protocols. When programming QSIG, you need to know if the system at the other end of the QSIG link is set to either ETSI QSIG or ISO QSIG. For example, if it is running ISO QSIG, then your system must also run ISO QSIG. As well, you need to know if the system at the other end of the QSIG link is set to either QSIG Master or QSIG Slave. For example, if it is set to QSIG Master, then you must set your system to QSIG Slave.

NOTE: Currently, QSIG does not support the CESID programming used for Emergency Services on a virtual network built on MITEL systems only. If you require such supplementary services at this time, implement a DPNSS protocol instead of QSIG.

Features supported by QSIG are:

- QSIG Call Forwarding and Diversion

- QSIG Call Offer

- QSIG Call Transfer

- QSIG Callback

- QSIG Calling Name

- QSIG Message Waiting Indication

- QSIG Path Replacement

Related Topics

- QSIG Conditions

- QSIG Operation

- QSIG Programming