[asterisk-bugs] [JIRA] (ASTERISK-20748) Asterisk system didn't accept some dtmf digits when It called by a external PBX phone

[Alec Davis (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-20748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=202279#comment-202279 ] 

Alec Davis commented on ASTERISK-20748:
---------------------------------------

Reverse Twist and Normal Twist:
from http://www.britishtelephones.com/dtmf.htm the 8dB and 4dB values are specific to UK.

{code}Twist is caused by a non-uniform power loss across the frequency spectrum.
 Normal twist is when low frequency power is greater than high frequency.
 Reverse twist is obviously the reverse condition.
 The detector must be reject 8db and 4db for normal and reverse twist respectively.
{code}
                
> Asterisk system didn't accept some dtmf digits when It called by a external PBX phone
> -------------------------------------------------------------------------------------
>
>                 Key: ASTERISK-20748
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-20748
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Core/General
>    Affects Versions: 1.8.18.0, 10.10.0
>         Environment: CentOS Linux, Asterisk 1.8.18.0, libPri 1.4-current, DAHDI 2.6
> Card Details : Single span digital telephony card TE121. and using PRI E1 lines 
>            Reporter: Ankit Mittal
>            Assignee: Ankit Mittal
>         Attachments: debug.txt, dsp.conf, fsReceive1.wav, fsTransmit1.wav
>
>
> When some one call on our DAHDI(asterisk) system by their landline phone or the mobile phone the call goes perfectly and asterisk accept each of the dtmf digit pressed at other end.
> but when the same call is done by their PBX phone, the system ignore some digits like when we press 100136972 it shows 100192, and if we do it again it shows 1001392.
> I have tried 
> 1. relaxdtmf = yes /no
> 2. toneduration = 300
> but nothing help me.

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