[Asterisk-Users] Problem with call drops

[Waldo Rubinstein]

Makes sense. I will be reworking the network cabling tomorrow and see  
how that behaves. Today I changed 2 workstations to a dedicated  
wireless network to see if they also experience call drops as  
frequent as the wired stations.

Thanks,
Waldo

On Nov 15, 2005, at 10:12 PM, gw at adcomcorp.com wrote:

> What kind of switches?  I would suggest go gigabit between your  
> servers,
> their switch, and the call center floor.  And, use managed switches if
> you are over 20 total stations.  Could be someone's got a p2p and  
> it is
> killing you.  Maybe unlikely, but quite possible.  Use some good 3com
> switches too, and totally avoid hub and daisy chaining.  Or get a
> managed switch with expansion switches if you are running a large  
> number
> of ports.  Either way, a single cable drop is a very bad idea.  You  
> get
> a snagged cable or something and you can be out of business because  
> of a
> stupid cable.
>
> Regards,
> Greg
>
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Waldo
> Rubinstein
> Sent: Tuesday, November 15, 2005 1:01 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: [Asterisk-Users] Problem with call drops
>
> Hello guys,
>
> I've been having a a recurring problem with people complaining about
> calls being dropped.
>
> I have 3 asterisk servers:
>
> Gateway: running Asterisk 1.2rc2 with TE410P connected to 4 T1s of the
> PSTN Server 1: running Asterisk 1.2rc2 with ztdummy using Gateway to
> access the PSTN (in/out) Server 2: running Asterisk 1.0.9 with ztdummy
> using Gateway to access the PSTN (in/out)
>
> I have agents connected to both Server 1 and Server 2.
>
> The problem is that every once in a while, agents complain that their
> calls dropped. Sometimes it's some agents that complaint, some other
> times, ALL agents complaint at the same time.
>
> When these complaints occur, the only thing I so is:
>
> 1) Issue a show channels on all three servers to see if there are any
> ongoing calls. I assume that if there are active calls, that not all
> calls dropped
> 2) Issue dmesg in Gateway to see if any of the T1s presented an alarm
> that could have dropped the calls
>
> In either case, I don't see any errors in dmesg indicating there were
> problems with the T1s and I always see active calls in all the  
> servers.
>
> What can I do to further troubleshoot this? If I look at the CDR, how
> can I tell that a call was "abnormally" terminated? Are there any  
> tools
> out there that would allow me to check the health status of the  
> working
> system and not just the "availability" of the machines? I was  
> looking at
> nagios but I don't know if it will do what I need to do.
>
> The other thing I could think of is that there may be a network  
> problem
> in the building. The way everything is connected is all agents are
> connected to a series of unmanaged switches in the "call center  
> floor",
> which are daisy chained together and then one is connected to the main
> switch with a single cable drop. The main switch is where the Asterisk
> servers are connected. I figured that if one of the switches in the  
> call
> center area fails, it could drop all calls or if there is a problem  
> with
> the cable drop from the main switch, that could also affect all  
> agents.
>
> Any advise will be greatly appreciated.
>
> Thanks,
> Waldo
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