Operational, Basic, and Advanced Parameters
A-76
41-001160-04 Rev 02, Release 2.5
IP Phone Administrator Guide
SIP Outbound Support
Parameter
–
sip outbound support
Configuration Files
aastra.cfg, <mac>.cfg
Description
Enables and disables whether or not the phone uses Draft 15
(draft-ietf-sip-outbound-15) support for SIP outbound packets.
A SIP User Agent (UA) behind a firewall, reuses an existing connection
(usually the REGISTER outbound connection) for the inbound request if
the proxy supports it. The UA uses keep-alive packets to monitor the
connection status.
Notes
:
1.
You must restart the phone after setting a value for this parameter.
2.
TLS and TCP both support this feature.
3.
If the Global SIP parameter “Persistent TLS” is set on the phone,
then only one TLS persistent connection can be established since the
phone uses the local port 5061 for connection. If the Global SIP
parameter “TLS” is set on the phone, more than one connection can be
setup since the phone uses a random local port for connection.
Format
Boolean
Default Value
0
Range
0 (disabled)
1 (enabled)
Example
sip outbound support: 1
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