AASTRA 6700i series, 9143, 9480i, 9480i CT SIP Administrator Guide EN - Manual (Page 802)

41-001343-01 Rev 03, Release 3.2.2 A-71
SIP Outbound Support
Parameter –
sip outbound support Configuration Files aastra.cfg, <model>.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.
4. This parameter must be enabled for this feature to start keep-alive
for a particular transport.
Format Boolean
Default Value 0
Range 0 (disabled)
1 (enabled)
Example sip outbound support: 1