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Operational, Basic, and Advanced Parameters
41-001343-02 REV04 – 05.2014 A-60
SIP Outbound Support
Contact Header Matching
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 REG-
ISTER outbound connection) for the inbound request if the proxy supports it. The UA
uses keep-alive packets to monitor the connection status.
Notes:
• If the Global SIP parameter “Persistent TLS” is set on the phone, then only one TLS per-
sistent 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 con-
nection can be setup since the phone uses a random local port for connection.
• 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
Parameter –
sip contact matching
Configuration Files
aastra.cfg, <model>.cfg, <mac>.cfg
Description Specifies the method for which the phone uses to match the Contact header in a SIP
registration packet.
Format Integer
Default Value 2 (matching username only)
Range 0(default) URI matching of username, domain name, phone IP and
port, and transport
1matching of phone IP only
2matching of username only
3matching of phone IP and username only
Example sip contact matching: 1