Number format in directory vs call display

[TM2-Megatron]

Hi,

I recently purchased a T48G for use with my home VOIP service. I've successfully set the phone up using the SIP credentials from my provider, but I've encountered an odd/annoying quirk. The call display number appears (in 10 digit form) on the phone's screen without any kind of formatting (e.g. 1231234567). This also creates a problem when I set up numbers in the phones directly using my preferred format of +1-123-123-4567 (I've become accustomed to it after using it exclusively on my cell). While that format works in the directory and dials out without issues, since the number is formatted differently and includes the country code, the phone won't pick up the contact name from the directory and display it with the caller ID info.

My question is whether or not there's something in the phone's settings to change the way it formats the phone number received from the caller ID data. At the very least, I'd like it to include the dashes, and preferably a country code as well (if not the "+" symbol).