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SIP Port Number

Assign the SIP port number of Telephone adapter. Its range is 1024 to

65535, default setting is 5060

Session Timer

SIP session refresh time interval. The time interval in which the phone

periodically refresh SIP sessions by sending repeated INVITE or Update

request, depending on session type. Its range is 1 to 65535, default setting

is 1800 seconds

Media Port Start

The starting range of port for RTP. Port number for initial of sending RTP

packet. Its range is 1024 to 65535, default setting is 5000

Media Port End

The ending range of port for RTP. Its range is 1024 to 65535, default

setting is 5050

RTCP Port

The Real Time Transport Control Protocol is based on the periodic

transmission of control packets to all participants in the session, using the

same distribution mechanism as the data packets. The underlying

protocol must provide multiplexing of the data and control packets. Its

range is 1024 to 65535, default setting is 5060

Transport

Assigns the default SIP transport protocol

UDP

Offering instead a direct way to send and receive datagram over an IP

network. It's used primarily for broadcasting messages over a network.

Here the UDP is a default setting