Auerswald COMpact 4000 Operation Manual page 588

Settings
VoIP
VoIP Settings
SIP
SIP port of the internal VoIP registrar (1 to 65535)
You will need to change this if one of the VoIP providers you use uses the default value 5060
set here.
Important:
If the SIP port of the internal VoIP registrar is modified while it is running,
all the calls will be interrupted.
Notes:
If the SIP port of the internal VoIP registrar is modified, the internal SIPS port
of the internal VoIP registrar is also changed automatically. The internal SIPS
port is calculated automatically from the SIP port of the internal VoIP
registrar + 1).
The page Overviews > Ports shows an overview of the PBX ports (incoming
and outgoing).
You must change the SIP port of the internal VoIP registrar in every VoIP
telephone that is connected to the PBX.
RTP
CPU
The RTP port is a port on the local system that is used as the outgoing port for RTP transfers.
Note: The page Overviews > Ports shows an overview of the PBX ports
(incoming and outgoing).
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COMpact 4000 - Firmware V6.6A - Installation, Operation and Configuration V03 03/2016