debug signalisation process

phartl · ‎07-09-2009

Hello group,

Question: I have an IP network with serveral locations. One location has a special problem. There are 7960 and 7970 IP Phones in use.

When I call to this location, the phone signals but it takes approximately 3 to 5 seconds for a call connect!!!! A call transfer is nearly impossible.

The network access is clean and with 4Mbit high enough. Trace and ping to the CUCM are OK.

No other location has this problem.

My question: How / Which debug can I use to find the problem ?

thx a lot

Patricio

Nicholas Matthews · ‎07-13-2009

Hi Patricio,

You can do a few things, but so far we have no idea what your call flow is.

Here are debugs for different situations:

FXO/FXS/T1 cas:

debug vpm signal

PRI:

debug isdn q931

H323:

debug h225 asn1

debug h245 asn1

SIP:

debug ccsip message

MGCP:

debug mgcp packet

SCCP:

debug sccp messages

You'll also want:

debug voip ccapi

Turn on this global command:

service timestamp debug datetime msec local

That will help you find out where the delay is in your network.

On your voice gateway, also use:

show voice dsp detail

Make sure that you don't have a message that says ! Non-default firmware is in use

or make sure your flash does not have: guido.dsp, hdv2.dsp, or dsp_c5510.rbf in your flash.

-nick

phartl · ‎07-13-2009

thx a lot

great

Patricio