Dynamic Rtp Port Start, Dynamic Rtp Port End; Type Of Service (Tos); Dtmf Payload Type; Network Identity (Port) - Snom 360 Manual

Settings
Advanced Network
In this section you can alter the advanced network settings of your
phone. This page has the following settings:

Dynamic RTP port start, Dynamic RTP port end

If you want to set up the port range out of which the RTP ports
dynamically will be taken from, specify the start port and end port
number respectively in this settings.

Type of Service (TOS)

You can set up the TOS field in this setting. A value could be i.e. 160.
This option enables the phone to support quality of service (QOS) in a
network, if all of the involved network parts are supporting QOS also.

DTMF Payload Type

Set up the payload type for Out of band DTMF here, by default 101. This
can be an arbitrary 8 bit value as long as the involved communication
partners are committed to use the same value each.

Network Identity (port)

Set a static local port number which is used for the SIP protocol
communication here. Usually the phone chooses a random one!
79