CONFIG_WARP is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

PIKA Warp

modulename: warp.ko

configname: CONFIG_WARP

Linux Kernel Configuration
└─>PIKA Warp
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
This option enables support for the PIKA Warp(tm) Appliance. The Warp
is a small computer replacement with up to 9 ports of FXO/FXS plus VOIP
stations and trunks.

See http://www.pikatechnologies.com/ and follow the "PIKA for Computer
Telephony Developers" link for more information.

source code:
selects
CONFIG_440EP

depends
CONFIG_44x