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Advanced Operational Features
41-001343-02 REV04 – 05.2014 6-33
Configurable Route Header in SIP Packet
The IP Phones support the following parameter:
• sip remove route
This parameter enables or disables the addition of the Route header in a SIP packet. Enable this parameter for outbound
proxies that do not support Route headers.
Enabling/Disabling the Route Header in the SIP Packet
Use the following procedure to enable/disable the addition of the Route header in the SIP packet.
Configurable Compact SIP Header
The phones provide a feature that allows an Administrator to shorten the length of a SIP packet by using the compact
form. This feature is in accordance with Compact SIP Headers defined in RFC 3261.
For example, the following SIP header is the long format:
Via: SIP/2.0/UDP 10.50.91.2:5060;branch=z9hG4bK571ebe0c;rport=5060;received=10.50.91.2
From: "Unknown" <sip:Unknown@10.50.91.2>;tag=as19d00fc8
To: <sip:1106@10.50.110.54:5060;transport=udp>;tag=916699998
Call-Id: 73cad5456806f3a7768d17e8617279d7@10.50.91.2
CSeq: 102 OPTIONS
The following SIP header is equivalent to the above SIP header, but uses the short (compact) format instead:
v: SIP/2.0/UDP 10.50.91.2:5060;branch=z9hG4bK571ebe0c;rport=5060;received=10.50.91.2
f: "Unknown" <sip:Unknown@10.50.91.2>;tag=as19d00fc8
t: <sip:1106@10.50.110.54:5060;transport=udp>;tag=916699998
i: 73cad5456806f3a7768d17e8617279d7@10.50.91.2
CSeq: 102 OPTIONS
By default, the IP Phones use the long format. However, an Administrator can provision the short (compact) format using
the configuration files. The Aastra Web UI does not support this configuration feature.
Enabling/Disabling the Compact SIP Headers Feature
Use the following procedure to enable/disable the Compact SIP Header in the SIP packet.
Reject INV or BYE when Unsupported Value in REQUIRE Header
The IP Phones support the following parameter:
• sip enforce require hdr
Note:
When enabled this will break all support for SIP routing, so if some other device in the network attempts to add itself
to the route it will fail.
Configuration Files
For the specific parameter you can set in the configuration files, see Appendix A, the section, “Route Header in SIP Packet” on pageA-213.
Configuration Files
For the specific parameter you can set in the configuration files, see Appendix A, the section, “Compact SIP Header” on pageA-213.