Telephony - Advanced Settings: Defining Local Communication Ports For Voip - Siemens Gigaset DX800A all in one Setup & User Manual

Telephony – Advanced Settings:
Defining local communication ports for VoIP
Specify which local communication ports (port numbers) the phone is to use for
VoIP telephony. The ports must not be used by any other subscriber in the LAN.
The following communication ports are used for VoIP telephony:
u
SIP port
Communication port via which the phone receives (SIP) signalling data
u
RTP port
Two consecutive RTP ports (consecutive port numbers) are required for each
VoIP connection. Voice data is received via one port and control data via the
other.
You can set port numbers or port number areas for SIP and RTP ports, or set your
phone to use any number of free ports from a predefined range of port numbers.
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Open the Settings
Listen ports for VoIP connections area
Use random ports
Click No if you want the phone to use the ports specified in the SIP port and RTP
port fields.
Select Yes, if you do not want the phone to use fixed ports for SIP port and RTP
port, but rather to use any free ports from predefined ranges of port numbers.
The use of random ports makes sense if you want multiple phones to be oper-
ated on the same router with NAT. The phones must then use different ports so
that the router's NAT is only able to forward incoming calls and voice data to one
(the intended) phone.
Use random ports = No
SIP port
Specify the port number for the SIP port. Enter a number between 1024 and
49152 in the field.
The default port number for SIP signalling is 5060.
The port number specified must not be in the RTP port number range.
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Telephony Advanced Settings Web page.
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