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The advantage to using a cordless or wireless phone is that that you have full duplex operation. A transmitter and receiver is on both at the phone base and receiver unit. This means much of the received audio and transmitted audio are kept separate (in most cases) until they get to the base unit. Otherwise you might have feedback when you send your mix back through the phone to the caller or callee. Sometimes it’s a delicate balance but it worked much better for us than any other method for live calls and remote broadcasts. The absolute best audio quality on remotes was by going cell phone to cell phone (both digital).
We’ve been using a two line V-tech digital cordless phone with great results. Like many others we can conference or place either line on hold right at the handset.
Most of the headset connections are standard. You can use an ohm meter to determine proper connections. I do have a pictoral guide, but I haven’t figured out how to attach a picture to a post (!). If you need it send me a message with your email address and I’ll send it to you. Just about every cell phone has an adapter that converts any proprietary connector to a standard headset jack (even the Nokia 5100’s, etc.). Some of the Nokias are using a 4 conductor headset plug which is harder to find.
By the way, for those of you doing remotes a cheap and effective way to send audio over a phone line is using one of the music on hold devices you can find online. Look for one with a standard earphone plug so you can input your own audio. then just dial, place the line on hold using the device and start sending your audio. I found one on an auction for just a few dollars.