M1 Messenger is a free messenger supporting SIP protocol
Use M1 Messenger instead of desktop IP phones.
Works with any SIP based PBX.
A push mode to save battery life.
SIP supporting advantages:
Easy routing audio and video calls from M1 Messenger's users to any Contact Center or IP PBX
You can make and receive calls to M1 Messenger using any IP phone or VOIP gateway
You can call to any M1 Messenger’s user from web page using WebRTC service
You can easily route any virtual phone number (DID) to M1 Messenger using SIP URI functionality