callee.
Active: To enable or disable Intercom feature.
Intercom Mute: If enabled, once the call established, the callee will
be muted.
Go to Account - Advanced to configure the SIP call related.
Max Local SIP Port: To configure maximum local SIP port for
designated SIP account.
Min Local SIP Port: To configure maximum local SIP port for
designated SIP account.
Caller ID Header: To choose Caller ID Header format.
Provisional Response ACK: 100% reliability for all provisional
messages, this means it will send ACK every time the IP phone
receives a provisional SIP message from SIP server.
Register with user=phone: If enabled, IP phone will send
user=phone within SIP message.
Figure 4.2.3 SIP call related