This post is written primarily for the benefit of mongo after his comment on this post. I figured it would benefit everyone. Therefore I am posting it here instead of a personal email to him.
He requested where he could get a nextel connector with a pigtail, with every signal pin available, to allow him to charge the phone, use the PTT switch, the earphone and microphone signal.
I cannot provide a source for a connector with a pigtail, although I can provide instructions for making one. Those instructions follow.

1. First you have to have a connector that has every pin there, these usually can be found off a cheap USB data cable from ebay, Power cables usually only have two pins (Power and Ground) and therefore are not useful for this task.
2. After obtaining your cable, use a small screwdriver, pen, or other small pointed object, at the location shown in the picture to pry it open.
   
3. after getting one side of the connector off you will see something similar to this, this one already had the wires desoldered from the connector.
   
4. After taking the rest off you will be left with the following pieces. (obviously you will have 2 clips, I only chose to show one here.
5. After you have the connector out you can desolder the existing wires and attatch your own to it, with a little heat shrink sleeving between each wire connection.

Nextel Connector Pinout

1. Ground
2. NC
3. Charge Voltage ( will charge with voltage >3.3v, 5 V works)
   
4. Tx
5. Rx
6. RTS
7. Power Provided by the phone to external Devices
   
8. CTS
9. DCD
10. RE
11. DTR
    
12. DSR
13. Serial Enable Not
    
14. NC (probably mic, headphone, or ppt)
    
15. NC (probably mic, headphone, or ppt)
16. NC (probably mic, headphone, or ppt)
17. Ground

I have not figured out which of the pins 14-16 are what, but as they are not used with the serial data that they should have something to do with the audio circuits. One way I would think to help give a start would be to get some sort of audio based IDEN connector device, and checking it out, otherwise trial and error with an earphone will help you find the audio output... Etc.

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