There are two issues. The first is you need to contact you power company as to what their requirements at the meter pan is. Some have specific ideas where your grounding system is to be located. At your service disconnect you must run ground to your buidlings grounding electrode system. If the service disconnect is inside and the grounding electrode is outside, it's put to you how you get it out there (and your local inspector).

Certain water pipes are indeed even to this day legitimate grounding electrodes. So are two ground rods.

You can connect your other system's grounding in there (but the run from the panel to the ground electrode MUST be continuous (one wire or approved "welded" connections)).
Ideally if the phone/cable enters the house at another point, they should ave their own ground rod and the two system grounds bonded together.

I plan to check with the local inspector. Guess my question was more about bonding the meter base and main panel together. Never seen the ground pulled out of the meter box at any of the homes I have lived in but it must be common place somewhere in the country as I see products like this:
http://www.youtube.com/watch?v=GzF6pgJRcPM

duplicate posting

This post was edited by jasmar on Sat, Dec 14, 13 at 15:13

Again, there's nothing (as far as the NEC goes) that prevents the ground even from the main panel running back through the meter panel through the meter box on it's way to the ground. If the POCO and the local inspector are OK with it, that's fine. Otherwise, you'll have to make some other hole in the house (if the grounding electrode connection is outside). One house I have has a hole bored into the basement rim joist (concrete foundation) for it. My other house has the disconnect on the outside of the house, so it's already out there.

All that "intersystem" grounding thing is a clever little thing that wraps around the grounding conductor to provide the bonding to the other systems. As long as you can slip it over the grounding conductor it will work (it cares not if it's actually connected to the meter pan itself). Since most times, the grounding conductor is already in place (and would be difficult to thread through such devices), people use other clamping terminals over the wire.

As stated the grounding electrode to service disconnect connection must be continuous.