SIP phone 4 ringbacks heard before 1st actual ring at phone

[Geezy]

Hi guys,

I have installed a Panasonic SIP phone and noticed that when I call into a POTS trunk that's point directly at the SIP phone, I hear 4 ring backs before the phone itself actually audibly rings once.

Anybody know the right adjustments I could possibly make to alleviate this?

Phone: Panasonic KX-TGP500
Mitel: 3300 MXe / Release level 6.0 SP3 / Active software load 12.0.3.15

[ralph]

This may be related to the caller ID coming across the trunk.
If the COS of the trunk says to expect caller ID but the trunk doesn't send it, the delay in ringing is a symptom.

Ralph