Need more rings

I just figured this one out for our office. I had to find the system manual online (don't know what happened to our copy), and it figures I was looking in the wrong place. Because the call is forwarded to your extension from the mail attendant, the solution is in Transfer System Options. This is 24-02 in System Data when logged into the server as an admin. Option 3 is Delayed Call Forward Time. Ours was set to 10 seconds (about 2.5 rings), and after changing it to 20 seconds it now rings 5 times before going to voice mail. And here I was looking under voice mail options for about an hour trying to figure this one out.
System Data
24-02 : Transfer System Options
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Copy Group 01 - Transfer to Busy Extension 02 - Ringback Tone to Transferred Calls Hold Tone Ringback Tone 03 - Delayed Call Forward Time 04 - Transfer Recall Time

You either need to have your call forward busy/no answer (CFB/NA) timer tweaked on the phone system or have the rings to answer setting changed on your voice mail system. Unfortunately, the former requires you to enter programming mode from either an admin phone (ext. 100 or 101) or through a maintenance interface computer (rare). The latter requires access to the voice mail computer terminal. Perform this test: Call your phone ext. from another ext. on the system. Count the number of seconds before it forwards. If this is the same number of seconds that an outside call rings before forwarding, it's the CFB/NA timer. If the time is different, it may be the voice mail rings to answer setting. If you turn forwarding off at your ext., call the number that rings too few times there and see if it goes to voice mail. If it still goes to voicemail with your forwarding off, it's a timer setting in the voice mail system. You need to determine if the voice mail system is holding onto the call before transferring it to the phone. For example, an outside call comes in and the auto-attendant (voice-mail) answers the call. I've programmed a lot of these systems with and without voice mail. They are very flexible and can be programmed to do seemingly the same thing in many different ways. The short answer is you're probably going to have to call a tech familiar with the system and how it's programmed. As a tech, I would need to determine if it was set up with a primary auto-attendant (voice mail picks up immediately with company greeting), had delayed ringing to an auto attendant (rings several times before company greeting), if the auto-attendant transferred blind or screened the transfer. It's about 14 key strokes from the attendant phone from start to finish.

You have to change the rings from the voice mail server. If you don't know your way around the server, its best to get a local NEC tech although it is fairly simple to navigate. Depends on your skill. Typical default password for the server is NEC