[Asterisk-Users] Ring Twice

[VoIP Newbie]

Hi all,

When I made calls from SIP phones through a analog PSTN gateway to
PSTN phones, I could hear rings twice on my SIP phones. From my best
guess, the first one from * and the second one from analog PSTN line.
Am I right? Is it configuration related? Can the two rings be reduced
to a single ring like we make normal analog PSTN call from a normal
PSTN phone?

Many Thanks.

Newbie