Defining Local Communication Ports For Voip - Siemens Gigaset A580IP Manual

Setting the phone with the PC
Preferred Refer To
Define the protocol (the contents of the "Refer To" information) that should be used
with preference when forwarding calls:
Target's contact info
This protocol is recommended for "closed" networks (internal company and
business networks).
Original URL
This protocol is recommended when the base station is connected to the Inter-
net via a router with NAT.
Automatic Refer To
If you select Yes, the base station will automatically attempt to determine the best
protocol.
If the base station cannot determine the best protocol, it will use the protocol
defined in Preferred Refer To.
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Select Set to save your settings.
Please note
For information on forwarding a call when you deactivate both Use the R key to
initiate call transfer with the SIP Refer method. and Transfer Call by On-Hook,
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Defining local communication ports for VoIP

Specify which local communication ports (port numbers) the telephone 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) signaling 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
telephone so that it can use any number of free ports from a predefined range of
port numbers.
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Open the following Web page: Settings
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Telephony Advanced Settings.