I am onsite at a new client's house. Old low voltage guy didn't run 2 Cat5 and RG6 as requested and homeowner didn't catch it until after they moved in.

I have Cat5 being used for computer but am not using RG6 going into client's home office.

Option 1
Take one pair out of Ethernet and use for phone but I thought that was no-no.

Option 2
Use RG6 and take my chances.

Option 3
Use phone outlet over A/C adapter. I hear that may interfere with WAP but don't know if true.

TIA

I would try RG6 first. Phone signal seems pretty unbreakable

We recently retro fitted a house where the entire phone/data structured wiring was done with shared Cat 5 lines. The work was done very clean and looked good, but nothing that i've ever tried. Basically 2 pairs for data and 2 pairs for phone. 

You can brown pair for phone but will limit your network to 10/100. No gigabit. Works perfectly.

Opition 1, if you don't need gigabit, will work fine.

Option 2 if you want to be chastised.

I think Option 1 is no longer an option with all the GB devices there are these days. All the places that are wired that way, the owners are going to be in for a real surprise at some point in time, and an installer is going to have to straighten it out somehow.

How about a ATT Dect 6.0 Phone system? That may fix the phone problem. Full wireless desksets and handsets.

+1 on take brown pair and make network 10/100.

Unless house is wired for a gigabit network, option one is the way to go.

You could also use this.  I think these units are at just about every disty, at least mine anyway.

http://www.wi3inc.com/

Use this for your internet and cable TV (if needed).  Use the Cat5 for phone

How do you 'make a network 10/100'?
What happens when someone plugs in a GB device or a POE device into a ethernet network wired incorrectly.

Gigabit devices will receive only100Mb atmost.  NO Go for POE, unless use the POE injector at the receiving end.

Option 3, wall ward devices will do.

That's wall wart, poetic techie for what one of those does to the appearance of a wall.

You can definitely use RG6 for phone lines, because phone signals are really stupid and don't care about much of anything, conductor-wise, except for not being connected to ground anywhere.

It will be difficult to keep it from looking real stupid, though, because you'll need to adapt from the wire style of RG6 to simple two conductors. I'd go with crimp-on RCAs, just to keep anyone from thinking there's RF on the wire, to chassis-mount solder or screw terminal jacks that you take wires off of.

If your email address is in your profile, I'm sending you my reference doc on how to use two pairs for network and one or two pairs for other stuff. That's also completely viable and even looks right if done that way during initial installation, but yes, it won't work with gigabit networks.

+1 and gigabit would not be an issue or possible over cat5 anyway

In this case, nothing other than dropping that node and any other it's connected to to 100 megabit. Nothing detrimental will occur as both ends of the cables pin 7 and 8 will be broken out. So unless they need gigabit interconnectivity between this node or even more doubtfully a gigabit connection to the WAN, this is the way to go; using pair 4 for the telephone.

Since when? First I'm assuming he has cat5e and second I've got gigabit LANs running on 5e all over the place working just fine all nodes showing 1 gigabit connections. Third, last I checked, the 1000Base-T was designed around cat5 or greater per 802.3ab...too lazy to look it up on my phone while traveling...so?