Let me know if I'm posting to the wrong forum. This is telecom related.

Just wondering if anyone here is familiar with using the Spirent Communications' Abacus CO switch / bulk call generator or other similar test tool like Hammer FX TDM.

On the Abacus1 platform, it supports E&M immediate start signaling for T1 CAS digital trunking. But in the software interface to Abacus, there are two selections:

"E&M immediate start" and "E&M Immediate Start (Cisco 2600)". I looked at the software help and documenation but that didn't really help in explaining the two options.

So I was wondering if anyone knows what's the difference between a basic/standard version of E&M immediate start and the Cisco 2600 version.