[Asterisk-Users] Resolving timing issues with dual PRIs in a TE411P

[Anthony Rodgers]

I'm not sure I follow - too much Christmas eggnog, perhaps.......

My understanding is that one of the spans is always primary - Asterisk 
will get its timing from that span unless no timing signal is present 
there, when it will go to the secondary source etc.

Just to avoid any confusion, our connections look like this:

Telus (telco) <-> Nortel PBX <-> Asterisk <-> Allstream (telco)

The Asterisk server is NET to the Nortel, and CPE to Allstream, and 
gets its timing from Allstream.
The Nortel is CPE to Telus, and gets its timing from Telus.

On Jan 3, 2006, at 3:34 PM, Casey Boone wrote:

> you could try setting the * box to pull timing from each pri connected
> to it and set the nortel to be a master for that circuit and see if 
> that
> helps any
>
> Casey
>
> Anthony Rodgers wrote:
> > Greetings, everyone, and Happy New Year!
> >
> > I have a question relating to running two PRIs into a single TE411P. 
> We
> > have been experiencing echo, noisy MOH, poor audio call quality and 
> so
> > forth that started at around the time we introduced the second PRI 
> into
> > the equation. Here is our zaptel.conf:
> >
> > span=1,2,0,esf,b8zs
> > bchan=1-23
> > dchan=24
> > #clear=1-24
> > loadzone = us
> > defaultzone=us
> >
> > span=2,1,0,esf,b8zs
> > bchan=25-27
> > dchan=48
> > #clear=1-24
> > loadzone = us
> > defaultzone=us
> >
> > And here is our zapata.conf:
> >
> > [trunkgroups]
> >
> > [channels]
> >
> > context=incoming
> > usecallingpres=yes
> > echocancel=128
> > callerid=asreceived
> > usecallerid=yes
> > echocancelwhenbridged=yes
> > echotraining=500
> >
> > ; Nortel PBX
> > rxgain=2.0
> > txgain=-17.0
> > group=1
> > callgroup=1
> > pickupgroup=1
> > switchtype=national
> > signalling=pri_net
> > facilityenable=yes
> > channel => 1-23
> >
> > ; Allstream PRI
> > rxgain=-2.0
> > txgain=-17.0
> > group=2
> > callgroup=2
> > pickupgroup=2
> > switchtype=dms100
> > signalling=pri_cpe
> > facilityenable=no
> > channel => 25-27
> >
> > musiconhold=default
> >
> > We are master to the Nortel PBX, which gets its clocking from Telus 
> (a
> > telco), and slave to the Allstream (another telco), from where the
> > Asterisk gets its clocking.
> >
> > We have been through the IRQ/APIC/hyperthreading thing already, and 
> our
> > gain levels were set using ztmonitor. zttest gives Best: 100.000000 
> --
> > Worst: 99.987793 -- Average: 99.998923 after 885 passes. We have
> > another, identical server that plays MOH with no problems without a 
> PRI
> > attached (presumably using internal clocking), and that same server 
> and
> > another similar server had no issues for months with only one PRI
> > attached (one had the Nortel and one had the Allstream, with an IAX
> > trunk between them).
> >
> > Is it possible that the two PRIs have timing differences between them
> > that could cause problems? If so, how best could we resolve them?
> >
> > Regards,
> _______________________________________________
> --Bandwidth and Colocation provided by Easynews.com --
>
> Asterisk-Users mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users