ringing but IVR not play

ffidx
Posts: 58
Member Since:
2009-09-23

Hi,
I've 3 pstn line which is terminated on fxo channel. when 1st 3 caller called to my number IVR plays but when 4th caller called then it is ringing and ringing and ringing but never plays IVR. after it again 3 caller can call but 4th one is suffer.
Should I change config in /etc/asterisk/zapata.conf ?

plz guide me.

regards,
ffidx