[cisco-voip] Slip Secs for Voice T1 of Cisco 2801 ISR ?

Tue Dec 7 15:07:00 EST 2004

fixed, thanks a lot!

----- Original Message ----- 
From: "Watson, Craig" <Craig.Watson at CommerceBank.com>
To: "Yunming Song" <yunming.song at digiconasp.com>
Sent: Tuesday, December 07, 2004 2:53 PM
Subject: RE: [cisco-voip] Slip Secs for Voice T1 of Cisco 2801 ISR ?

You have half of the config already in your router (I believe some of it is 
put in there by default).

The next command you will want to enter is network-clock-select command 
using the below script.  I'm not sure what slot or port your PRI is coming 
in on.  Apply that and see if it fixes your problem.

-----Original Message-----
From: Yunming Song [mailto:yunming.song at digiconasp.com]
Sent: Tuesday, December 07, 2004 1:19 PM
To: Watson, Craig
Cc: Yunming Song
Subject: Re: [cisco-voip] Slip Secs for Voice T1 of Cisco 2801 ISR ?

Craig,

thanks for your quick return.
What is the exact network-clock-participate command?
I had already configured "clock source line",
which is the default command under T1, the result is the same.

Yunming

----- Original Message -----
From: "Watson, Craig" <Craig.Watson at CommerceBank.com>
To: "Yunming Song" <yunming.song at digiconasp.com>
Sent: Tuesday, December 07, 2004 1:42 PM
Subject: RE: [cisco-voip] Slip Secs for Voice T1 of Cisco 2801 ISR ?

>From Cisco:

"Slips are caused by the inability of an equipment buffer store (or other
mechanisms) to accommodate differences between the phases or frequencies of
the incoming and outgoing signals in cases where the timing of the outgoing
signal is not derived from that of the incoming signal."

To eliminate the problem, you must change the default clocking behavior
through Cisco IOS configuration commands. It is absolutely critical to set
up the clocking commands properly.
Since you already have network-clock-participate in there, you will probably
want to add network-clock-select priority {bri | t1 | e1} slot/port  as
well.
The network-clock-participate command allows the router to use the clock
from the line via the specified slot and synchronize the onboard clock to
the same reference.
See if that works for ya.
Craig

-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net]On Behalf Of Yunming Song
Sent: Tuesday, December 07, 2004 12:32 PM
To: cisco-voip at puck.nether.net
Cc: Yunming Song
Subject: [cisco-voip] Slip Secs for Voice T1 of Cisco 2801 ISR ?

Hello Group,

We installed CallManager 3.3(4) and Voice Gateway 2801,
inbound and outbound DID calls are fine, but we continuously receive
the increasing 'Slip Secs' errors by using "show controllers T1 0/1/0".

Check around Cisco solution, it is basically time synchronous issue,
worked with Verizon (PSTN Provider), they said that their side is
fine, no error happens.

Could somebody help me look at the configuration file (see attached)?
Your idea and advice is pretty much appreciated.

thanks,
Yunming Song
Digicon Corporation
571-323-5030

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