[asterisk-ss7] MTP2 CRC errors resulting in flapping link

Paul Cadach paul at odt.east.telecom.kz
Mon Jul 3 05:18:40 MST 2006


Patrick wrote:
> > And on the other side of the SS7 link on an Alcatel switch there are
> > CRC16 messages logged. I also see
>  ^^^^^^
> Don't know if it's of any help but afaik the only CRC setting that the
> zaptel drivers know about is CRC4. CRC16, by name, seems different.
> Perhaps you could try disabling CRC checking on both sides and see if
> the problem goes away or, if possible, activate CRC4 (not CRC16)
> checking on the Alcatel switch & your Asterisk box.

You mix CRC4 (which is used to check CAS signalling/framing consistency) and
CRC16/CRC32 (which is used to check HDLC frame consistency).

Looks like interrupt/CPU load is high which causes raw time slot data looses.


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