[Asterisk-Users] Moments of silence - take2

[Colin Anderson]

We had the same kind of issue with a VPN to our Calgary office. The VPN was
so slow, it was unusable and would periodically drop. Doing a traceroute, we
found that the packets would take a stupid route to Calgary, basically they
would be backhauled to routers all over North America, when we *knew for a
fact* that the target was only a couple of hops away. 

The solution was some very politely worded emails to my ISP's upstream
provider, with relevant traceroutes attached. They modified their routing
tables, and thanked us for bringing this routing issue to their attention,
as it helped out some other people that were having similar problems
(whether they were aware, or didn't care, dunno.) For the record, the
upstream provider was Sprint (at the time - who the hell knows these days!).
Problem solved. 

So maybe your first course of action is to get metrics on the problem with
traceroute over a period in time. Maybe cron a script to traceroute every 3
min to a log file for a few hours, then analyze the logs and look for high
lag times. You should be able to identify a couple of routers that are
causing the trouble. Then, armed with your data, you can contact those
upstream providers with details and see what they can do for you. The Tier 1
guys are professionals, and they will probably help you out if you ask
really nicely. 
 
-----Original Message-----
From: Adam Moffett [mailto:adam at plexicomm.net]
Sent: Friday, November 04, 2005 1:26 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: [Asterisk-Users] Moments of silence - take2

I'm sorry, that previous message might have made more sense if it had
all the information that I had intended to send.

We are having moments of silence in the middle of phone calls. 
Generally it's not more than a few seconds, but it's still a nuisance. 
Our IAX providers (we have 2) become unreachable for periods of 5-15
seconds roughly 3 times an hour.  It happens to both providers, but not
at the same time.  Below you'll find a log excerpt (cat messages | grep
teliax) with regards to that.

I was wondering if the two issues are related.  Either way, does any one
have any experience with regards to silence in the middle of phone
calls?  What possible causes should I be looking at.




Nov  2 17:44:36 NOTICE[16535] chan_iax2.c: Peer 'teliax' is now
UNREACHABLE! Time: 68
Nov  2 17:44:46 NOTICE[16535] chan_iax2.c: Peer 'teliax' is now
REACHABLE! Time: 69
Nov  2 18:42:56 NOTICE[16535] chan_iax2.c: Peer 'teliax' is now
UNREACHABLE! Time: 68
Nov  2 18:43:06 NOTICE[16535] chan_iax2.c: Peer 'teliax' is now
REACHABLE! Time: 67
Nov  2 20:03:17 NOTICE[16535] chan_iax2.c: Peer 'teliax' is now
UNREACHABLE! Time: 68
Nov  2 20:03:27 NOTICE[16535] chan_iax2.c: Peer 'teliax' is now
REACHABLE! Time: 67
Nov  2 23:26:46 NOTICE[16535] chan_iax2.c: Peer 'teliax' is now TOO
LAGGED (2076 ms)!
Nov  2 23:26:56 NOTICE[16535] chan_iax2.c: Peer 'teliax' is now
REACHABLE! Time: 68
Nov  2 23:44:01 NOTICE[16535] chan_iax2.c: Peer 'teliax' is now
UNREACHABLE! Time: 68
Nov  2 23:44:11 NOTICE[16535] chan_iax2.c: Peer 'teliax' is now
REACHABLE! Time: 68
Nov  2 23:58:16 NOTICE[16535] chan_iax2.c: Peer 'teliax' is now
UNREACHABLE! Time: 70
Nov  2 23:58:26 NOTICE[16535] chan_iax2.c: Peer 'teliax' is now
REACHABLE! Time: 73
Nov  3 02:58:48 NOTICE[16535] chan_iax2.c: Peer 'teliax' is now
UNREACHABLE! Time: 67
Nov  3 02:58:58 NOTICE[16535] chan_iax2.c: Peer 'teliax' is now
REACHABLE! Time: 69
Nov  3 06:24:19 NOTICE[16535] chan_iax2.c: Peer 'teliax' is now
UNREACHABLE! Time: 69
Nov  3 06:24:29 NOTICE[16535] chan_iax2.c: Peer 'teliax' is now
REACHABLE! Time: 68
Nov  3 06:29:31 NOTICE[16535] chan_iax2.c: Peer 'teliax' is now TOO
LAGGED (2086 ms)!
Nov  3 06:29:42 NOTICE[16535] chan_iax2.c: Peer 'teliax' is now
REACHABLE! Time: 69

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