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

[Russ Meyerriecks (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-14937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=216691#comment-216691 ] 

Russ Meyerriecks commented on ASTERISK-14937:
---------------------------------------------

This looks very similar to the callerid issue that I just closed:

https://issues.asterisk.org/jira/browse/ASTERISK-23488

In my debugging I would also see the "No start bit found in fsk data" after the CID checksum was failed, the second ring was placed, and then the retry logic interrupted by the call pickup.

> 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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