I think arvind is talking about following parameterMGCP Network Location OffNet for E1 and T1 : This parameter provides a distinctive ring for calls that come in through the MGCP E1 andT1 (both PRI and CAS) gateway. These gateways can be configured a...

try this link ..http://www.cisco.com/en/US/customer/netsol/ns340/ns394/ns165/ns391/networking_solutions_design_guidance09186a00801f8e31.html

Great Reply !!I thought I knew a lot about IOS ......you proved me wrong ....5 points

This document should help http://www.cisco.com/en/US/partner/netsol/ns340/ns394/ns165/ns391/networking_solutions_design_guidance09186a00801f8e31.html

See ...if you have 128 MB DRam and 16 MB flash on the switch you can go for ADVANCED IP SERVICES feature set.here is the link http://www.cisco.com/cgi-bin/Software/Iosplanner/Planner-tool/iosdownload.cgi?ftpfile=%2Fswc%2Fesd%2F01%2Fcrypto%2F3DES%2F2...