Most important (DELAY PROBLEM)

Hi,

We have technical difficulties our test that will be in production environment.

actually that system seems working quite well.

our system based on 3 parts.

firs gsm gateway that have plugged lots of gsm cards
second asterisk based on centos 5.2 64 bit
third softphone based on windows system

our topology like this
( LAN CONNECTION) ( LAN CONNECTION)
(GSM GATEWAY)-------sip trunk------(ASTERISK)------(WINDOWS XP CLIENT AND SOFTPHONE)

but we make outgoing call to cellphone almost 1 second delay
total device on test environment 1 pc, 1 asrterisk,1gsm gateway.
and how can we measure this delay with details.

thanks for your help.