Aastra Telecom CT9143i - Manual (Page 62)

New Features in Release 2.3
58 RN-001029-02, Release 2.3, Rev 00
IP Phone Release Notes 2.3
Ignore Out of Sequence Errors
In Release 2.3, an Administrator can configure the phone via the “sip accept out of order
requests” parameter to ignore CSeq number errors on all SIP dialogs on the phone. When this
parameter is enabled, the phone no longer verifies that the sequence numbers increase for each
message within a dialog, and does not report a "CSeq Out of Order" error if they do not increase.
Enabling/Disabling “Out of Order SIP Requests”
Use the following parameter to enable or disable the SIP out of order requests. BL
Note: As the default Asterisk configuration does not fully track dialogs
through a reboot, it is recommended that this parameter be enabled when
using the BLF feature with an Asterisk server. If you do not enable this
feature, then rebooting the Asterisk server may cause BLF to stop
working. With this parameter enabled, the BLF key starts working again
when the phone re-subscribes, which by default, are one hour apart.
Parameter–
sip accept out of order
requests
Configuration Files aastra.cfg, <mac>.cfg
Description Enables a workaround for non-compliant SIP devices (for example, Asterisk)
which do not increment the CSeq numbers in SIP requests sent to the
phone.
Format Boolean
Default Value 0 (disabled)
Range 0 (disabled)
1 (enabled)
Example sip accept out of order requests: 1