[cisco-voip] Call delays MGCP gateway

[cisco.voip]

I am having an issue with our Cisco MGCP gateway 2811 PRi interface to an 
Lucent PBX.
We have a CCM 4.2 clsuter, the initial call through the GW to a phone on the 
PBX takes almost 30 seconds to
send the digits over the PRI to the PBX, subsequent calls from the phone to 
the PBX are less than 1 second setup time.
Therefore, it seems the delay is on the ip side on the inital call only, 
does anyone have an thoughts for checking this out.

Thanks