AudioCodes MediaPack MP-11 Series Troubleshooting Manual page 26

Possible Cause
The FXO interface does not
6.
send a SIP 200 OK response
message to the IP side.
Troubleshooting Guide
MediaPack, Mediant 1000, Mediant 2000
The FXO should send a SIP 200 OK response message to
the IP side that originally sent the INVITE request message.
In the Syslog, ensure that the following message appears:
---- Outgoing SIP Message to
NOTICE: SIP/2.0 200 OK
If this message does not appear, perform the following:
If the PBX implements Polarity Reversal, ensure that
1
EnableReversalPolarity is set to 1 (the device sends SIP
200 OK message only upon detection of polarity
reversal). Otherwise, ensure that EnableReversalPolarity
is set to 0.
Check the settings of the parameter
2
EnableVoiceDetection.
If it is set to 1, the device sends 200 OK (to INVITE)
messages when speech is detected from the Tel
side. Therefore, start speaking immediately after
answering the PBX phone.
If it is set to 0, the device immediately sends 200 OK
messages after the device completes dialing to the
Tel side.
If the problem persists despite all the previous
troubleshooting, send the AudioCodes Technical Support
team the following information:
The device's ini file
A Syslog trace
26
Solution
Document #: LTRT-57601