| Hi galexioy, I don't want to use standard ETSI/QSIG over copper. This would require having permanent fixed circuits between all sites (from UK to Spain) and have expensive monthly costs attached. We have existing VPN links between all sites and putting voice over those links would mean free calls. With this, we require features like name display, CLI etc that QSIG supplies.
After doing some digging and reading, it looks like SIP will be supporing feautures like these.
Does anyone know if the 4400 supports SIP?
Thanks in advance |