Aastra Telecom 53I User Manual

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Advanced Operational Parameters
A-176
41-001160-00, Release 2.1, Rev 04  
IP Phone Administrator Guide
Appendix A
Symmetric UDP Signaling Setting
User-Agent Setting
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
Parameter – 
sip user-agent
Configuration Files aastra.cfg, <mac>.cfg
Description
Allows you to enable or disable the addition of the User-Agent and 
Server SIP headers in the SIP stack.
The value of “0” prevents the UserAgent and Server SIP header from 
being added to the SIP stack. The value of “1” allows these headers to 
be added.
Format
Boolean
Default Value
1 (true)
Range
0 (false)
1 (true)
Example
sip user-agent: 0