(supersedes <mn.94367d75fee30095.48968@blueyonder.invalid>)

Phas laid this down on his screen :[color=blue]
> There is a standard headphones jack for a headset on my IP telephone,
> and I'd like to connect an answering machine to it. The trouble is I
> can't find any answering machine in stores that has the headphone
> jack. Also, couldn't find any regular answering machine for IP
> telephones in VOIP internet stores.[/color]

Is there any reason you can't use a voicemail service from your
Internet Telephony Service Provider?

If not, I would suggest obtaining an Analogue Telephone Adapter,
configure it with the same credentials as your IP phone, & plug your
answer phone into that......