MD110, Patton, OpenSIPS and Phone Ringing...

[michelepin]

Hi all,

i have a VoIP system connected, via Patton, to a PRI on our principal switchboard (MD110). All works except the ringing that a caller hear on the phone when calling someone on VoIP side. My topology:

(PSTN) --- MD110 --- E1 TRUNK ---- PATTON ---- OPENSIPS --- (VOIP PHONES)
|
(INTERNAL PHONE)

When i call from INTERNAL PHONE to VOIP PHONES, i can't hear any ringing while VoIP phone ring as usual. On OpenSIPS i saw that the 180 "Ringing" signal was sent to Patton.

Any hint ?

Michele