Before you push record, be sure to tell the person on the other end of the line you're recording; depending on your location, you may be breaking a law if you don't. Some US states—like New York and even the feds—only require one-party consent, which means you can record without telling the other person or persons. In California, all parties must know they're being recorded—even if the recorder is out of state. Under federal law, one-party consent is okay, but only if you're part of the conversation; otherwise that's considered eavesdropping.
Techjunkie.com One sign that your phone calls are being ignored is how many rings before it goes to voicemail. Generally, the feedback ringtone will go through several cycles before the voicemail message comes up. If upon placing the phone call, it rings only once or twice and goes to voicemail then your calls are probably being declined. 443 is also the number to dial to retrieve voicemails. To switch voicemail off dial 1626. Voicemail deducts one minute from your Goodybag regardless of length of call (assuming you have minutes left) or, if not, costs 8p per call.

Don’t rush. It’s important to speak slowly and clearly when leaving your next voicemail greeting. Have you ever called someone and the message sounds like one big word? Don’t be that guy. Pronounce your words and take pauses between your sentences
A relatively unprofessional one — like mine, for instance — does the opposite: It encourages prospects, recruiters, and potential connections to run in the other direction.