[asterisk-r2] How to configuration for Polarity Reversal for DTMF R2

[Piyawit Khumkrong]

Dear , all expert

I have a problem with R2(DTMF) connection the solution is 1 port to Telco 1
port to NEC

so the problem is NEC can't detect answered call to billing system and can't
transfer the call from operators

then NEC engineer said "that is the problem from polarity reversal" can
anyone tell me

how to configuration for polarity reversal in asterisk with Sangoma A102 ?

-- 
Best regards

ปิยวิทย์ คุ้มครอง (เอส)
Piyawit Khumkrong (S)
Technical Department
AISTelebiz Co.,Ltd
Tel.(+66)0-2946-1490 Ext.905
Email:piyawit at aistelebiz.com <piyawit at aistelebiz.com>
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