Voice/Data T1/E1 Crossover back-to-back Cable DIY or Buy?

Hi All,
I am trying to build a Voice lab and it's starting to cost a fortune for the kit.
I have seen a T1/E1 cross over cable on the link below and I need two of these from my set up
http://www.ebay.co.uk/itm/UTP-Voice-data-T1-E1-Cross-Crossover-back-to-back-Cable-Cisco-Voice-CCIE-CCVP-/230771200798#ht_1364wt_1231
Could anyone advise if this is a special type of UTP cable or is this standard Ethernet cable with RJ45 connectors just with a different pinout configuration?
If it's just the order of the wires in the cable I have a reel of UTP and a crimping tool I can use to make my own
Your help is appreciated as always
Cheers,
David

T1/E1 cross over cable is very easy. You should make yours and dont waste your money buying ready made..
The pin out you need is this..
1----------->4
2----------->5
4----------->1
5----------->2
The images below shows you the pin out configuration
https://www.google.co.uk/search?q=t1/e1+crossover+cable&tbm=isch&tbo=u&source=univ&sa=X&ei=EnRqUrmdK8GW0AWKsIGYDw&ved=0CD0QsAQ&biw=1600&bih=799
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