12-10-2007 06:55 AM
Hi all
We are using an AS5350XM as a GTW and all voice traffic on a VPN.
we get a fair bit of X-tall...since I am no voice expert but kno what that I should not be getting this issue with VoIP.
Any thoughts ?
TIA
Sam
12-10-2007 08:08 AM
Sam,
Are there any analog legs to the calls? Maybe POTS lines to a small business? You are correct that VOIP or other digital formats are not prone to cross talk.
Dave
12-10-2007 08:24 AM
Hi there
yes there is an analog leg to a local telephony provider (3 E1 are used).
where should I start looking, at present I am looking at debug MGCP errors. trying to find a pattern on where call X-talk on on which channel they are carried.
TIA
Sam
12-10-2007 10:07 AM
Sam,
E1s are TDM and digital so that is not likely to be where the crosstalk is occurring. Where are the endpoints? Any analog service involved?
Can you place test calls that exhibit crosstalk?
If you can pin it down to calls on a specific E1, you could try swapping ports to see if the problem follows the circuit or the port. A faulty DSP could cause crosstalk (though I have never seen it).
Dave
12-10-2007 10:32 AM
Hi Dave
only the 1st 4 E1 are in use.
I agree that I need to correlate a call with X-talk to a particular channel...how is my problem.
Sam
sh mgcp endpoint
E1 S3/0 ds0-group 1 timeslots 1-15,17-31 type none
E1 S3/1 ds0-group 0 timeslots 1-31 type none
E1 S3/2 ds0-group 1 timeslots 1-15,17-31 type none
E1 S3/3 ds0-group 0 timeslots 1-31 type none
E1 S3/4 ds0-group 0 timeslots 1-31 type none
E1 S3/5 ds0-group 0 timeslots 1-31 type none
E1 S3/6 ds0-group 0 timeslots 1-31 type none
sh voice dsp, does not show much.
DSP DSP DSPWARE CURR BOOT PAK TX/RX
TYPE NUM CH CODEC VERSION STATE STATE RST AI VOICEPORT TS ABORT PACK COUNT
==== === == ======== ======= ===== ======= === == ========= == ===== ============
12-11-2007 02:55 PM
Sam,
Try debug isdn q931.
That will show you calling/called number and E1 channel used.
Please rate helpful posts.
12-11-2007 08:42 PM
Is the problem fixed?
E1s can't have cross talk, but if they are wrongly patched, they do cause cross talk, like swapping, TX and RX.
Please verify the patching of E1s.
12-11-2007 10:37 PM
Hi
problem is still there, I will do some debugging as suggested by Dave.
all what I need is to correlate a bad E1 to a corrupted call. then the fault is isolated and can be dealt with.
I will feedback either way when I am done with debug.
Many thanks for the replies !
Sam
12-13-2007 06:25 AM
debug isdn is not suported, I am using
debug mgcp XX instead..with thsi casn see teh endpoint when calls are made.
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