Snom 100 Administrator's Manual page 41

H.450 Services
The menu item "Settings / H323 / H.450 Services" can be used to
toggle between H.450 (<on>) and facility based (<off>) supplementary
services (hold, divert, etc).
Press the menu key in the idle state and select the submenu
"Settings / H323 / H.450 Services".
Tracing
Enables and disables the tracing of the H323 stack.
Press the menu key in the idle state and select the submenu
"Settings / H323 / Tracing".
Dynamic RTP Start Port (web interface only)
First dynamic RTP port which is chosen by the phone when
establishing a connection.
Dynamic RTP End Port (web interface only)
Last dynamic RTP port which is chosen by the phone when
establishing a connection.
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