Aastra Telecom 53I - Manual (Page 116)

Other Interoperability Features
110 RN-001029-00, Rev 03, Release 2.1
IP Phone Release Notes 2.1
Configuring Symmetric UDP Signaling Using Configuration Files
You use the following parameter to configure symmetric UDP signaling in the
configuration files:
sip symmetric udp signaling
Parameter –
sip symmetric udp signaling Configuration Files aastra.cfg, <mac>.cfg
Description Allows you to enable or disable the phone to use port 5060 to send SIP
UDP messages. The value “1” (which is the default) enables the phone
to use port 5060. The value “0” (zero) disables the phone from using
port 5060 and allows the phone to choose a random port to send SIP
UDP messages.
Format Boolean
Default Value 1 (enabled)
Range 0 (disabled)
1 (enabled)
Example sip symmetric udp signaling: 0