asterisk users - Feb 2007 - PSTN Calls from SI.P: buzzing and pops

We have SIP phones connecting to *, and our PSTN lines connecting 
through an Astribank FXO.

Internal Sip<->SIP calls are clear.
External calls through the Astribank get occassional low level buzzing 
for about 1/2 - 1 sec at a time.

Those are usually accompanied by some light pops or static

No transcoding, all ulaw.
PSTN lines come from an Adtran IAD channel bank about 10 ft of cable 
from the Astribak. Astribank and Adtran are both chassis grounded to our 
  UPS.

Tried set echocancel=on and echocancel=off in the zapata.conf... No 
difference.


Any ideas??

Thanks,
Allen.

On Fri, Feb 16, 2007 at 12:39:54AM -0500, Allen Casteran
wrote:
> We have SIP phones connecting to *, and our PSTN lines connecting 
> through an Astribank FXO.
> 
> Internal Sip<->SIP calls are clear.
> External calls through the Astribank get occassional low level buzzing 
> for about 1/2 - 1 sec at a time.
> 
> Those are usually accompanied by some light pops or static
> 
> No transcoding, all ulaw.
> PSTN lines come from an Adtran IAD channel bank about 10 ft of cable 
> from the Astribak. Astribank and Adtran are both chassis grounded to our 
>  UPS.
> 
> Tried set echocancel=on and echocancel=off in the zapata.conf... No 
> difference.
You mentioned (in another mail) that if you connect the same line to the
PSTN the line is clear. Was it in the same setup or were there some
resets and/or reconfigurations in the process?

If you connect a simple phone insted of the Astribank, do yu have the
same problems?

-- 
               Tzafrir Cohen       
icq#16849755                    jabber:tzafrir@jabber.org
+972-50-7952406           mailto:tzafrir.cohen@xorcom.com       
http://www.xorcom.com  iax:guest@local.xorcom.com/tzafrir

Tzafrir Cohen wrote:
> On Fri, Feb 16, 2007 at 12:39:54AM -0500, Allen Casteran wrote:
> 
>>We have SIP phones connecting to *, and our PSTN lines connecting 
>>through an Astribank FXO.
>>
>>Internal Sip<->SIP calls are clear.
>>External calls through the Astribank get occassional low level buzzing 
>>for about 1/2 - 1 sec at a time.
>>
>>Those are usually accompanied by some light pops or static
>>
>>No transcoding, all ulaw.
>>PSTN lines come from an Adtran IAD channel bank about 10 ft of cable 
>>from the Astribak. Astribank and Adtran are both chassis grounded to our
>> UPS.
>>
>>Tried set echocancel=on and echocancel=off in the zapata.conf... No 
>>difference.
> 
> 
> You mentioned (in another mail) that if you connect the same line to the
> PSTN the line is clear. Was it in the same setup or were there some
> resets and/or reconfigurations in the process?
> 
> If you connect a simple phone insted of the Astribank, do yu have the
> same problems?
Same setup.
We replaced analog phones with the * Server and then noticed the 
buzzing.  Before installing the * server the analog phones had been used 
on the same lines with no problems for about a year. No changes have 
been made to the lines themselves.

The buzz occurs every minute or so, but not on any schedule that I can 
determine. (ie not every 65 seconds).
I have done several config changes on the * server to try and eliminate 
the problem to no avail.

As a follow up test, I unplugged line 1 from the Astibank and connected 
it to a butt set. Placed a call into my own office and listened to 10 
minutes of voice mail. Clean sound. No crackles or buzzing.

Reconnect the CO line to the Astribank and place same call to my office.
Listen to voicemail and hear 3 pops, buzzes in 2-3 minutes.

Ideas?

On Fri, Feb 16, 2007 at 03:27:15AM -0500, Allen Casteran
wrote:
> As a follow up test, I unplugged line 1 from the Astibank and connected 
> it to a butt set. Placed a call into my own office and listened to 10 
> minutes of voice mail. Clean sound. No crackles or buzzing.
> 
> Reconnect the CO line to the Astribank and place same call to my office.
> Listen to voicemail and hear 3 pops, buzzes in 2-3 minutes.
uname -r

cat /proc/xpp/sync

-- 
               Tzafrir Cohen       
icq#16849755                    jabber:tzafrir@jabber.org
+972-50-7952406           mailto:tzafrir.cohen@xorcom.com       
http://www.xorcom.com  iax:guest@local.xorcom.com/tzafrir

Tzafrir Cohen wrote:
> On Fri, Feb 16, 2007 at 03:27:15AM -0500, Allen Casteran wrote:
> 
>>As a follow up test, I unplugged line 1 from the Astibank and connected 
>>it to a butt set. Placed a call into my own office and listened to 10 
>>minutes of voice mail. Clean sound. No crackles or buzzing.
>>
>>Reconnect the CO line to the Astribank and place same call to my office.
>>Listen to voicemail and hear 3 pops, buzzes in 2-3 minutes.
> 
> 
> uname -r
2.6.9-42.0.8.ELsmp
> cat /proc/xpp/sync
# To modify sync source write into this file:
#     HOST        - For host based sync
#     0 0         - XBUS-0/XPD-0 provide sync
#     m n         - XBUS-m/XPD-n provide sync
HOST
tick: #6109170
tick rate: 1000/second (SAMPLE_TICKS=10000)

On Fri, Feb 16, 2007 at 04:00:36AM -0500, Allen Casteran
wrote:
> Tzafrir Cohen wrote:
> >On Fri, Feb 16, 2007 at 03:27:15AM -0500, Allen Casteran wrote:
> >
> >>As a follow up test, I unplugged line 1 from the Astibank and
connected
> >>it to a butt set. Placed a call into my own office and listened to
10
> >>minutes of voice mail. Clean sound. No crackles or buzzing.
> >>
> >>Reconnect the CO line to the Astribank and place same call to my
office.
> >>Listen to voicemail and hear 3 pops, buzzes in 2-3 minutes.
> >
> >
> >uname -r
> 2.6.9-42.0.8.ELsmp
> 
> >cat /proc/xpp/sync
> 
> # To modify sync source write into this file:
> #     HOST        - For host based sync
> #     0 0         - XBUS-0/XPD-0 provide sync
> #     m n         - XBUS-m/XPD-n provide sync
> HOST
> tick: #6109170
> tick rate: 1000/second (SAMPLE_TICKS=10000)
Any change if you run:

  echo 0 0 >/proc/xpp/sync

(or maybe instead of 0: the number of your FXO unit).


-- 
               Tzafrir Cohen       
icq#16849755                    jabber:tzafrir@jabber.org
+972-50-7952406           mailto:tzafrir.cohen@xorcom.com       
http://www.xorcom.com  iax:guest@local.xorcom.com/tzafrir