LIST OF SUPPORTED SIP PABX VENDORS

You must be wondering how many products out there in the market, who does support SIP (Session Initiation Protocol. SIP is now a very common and known protocol among the Telecom and VOIP application which really helps 3rd party applications to integrate with each other. To know more you can refer to the link here, which has detail information

here is the list of vendors and their systems which supports SIP protocol.

Credit : Virocom