[asterisk-bugs] [JIRA] (ASTERISK-14937) v23 caller id detection (UK) less than 100%

[Matt Jordan (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-14937?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matt Jordan closed ASTERISK-14937.
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    Resolution: Fixed

> v23 caller id detection (UK) less than 100%
> -------------------------------------------
>
>                 Key: ASTERISK-14937
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-14937
>             Project: Asterisk
>          Issue Type: Bug
>          Components: Channels/chan_dahdi
>            Reporter: trouble dog
>            Severity: Minor
>         Attachments: clid66.out
>
>
> Around 1 in 100 will fail with callerid.c: No start bit found in fsk data
> After implementation of polarity detection in wcfxo.c I initially believed there was an issue with my implementation or the hardware (X100P SE). I setup enhanced logging and data capture and discovered that this was not the case. There is a certain amount of noise present most of which could be removed with a band pass filter, which I believe should help detection rates. I do not believe the noise is inherent in the line, most of the noise can be characterised as low frequency noise (mentioned in si3034 spec as dc offset) and 4khz squeal. I have the raw data captured directly from wcfxo if there is any interest in improving this. 
> ****** ADDITIONAL INFORMATION ******
> Steps to reproduce
> Repeatedly dialing my PSTN line via sip trunk e.g.
> RetryDial(|15|-1|...|15|d)



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