Here's some info on dialing, copied from the XLink manual:
PlaCING a Call
XLink ITC-BTTN is designed to work with your standard phone and your telephone service or independently of your telephone service. If you have connected your telephone service line to the XLink you will dial out directly by simply picking up the phone and dialing. If you wish to dial out on your cell phone simply select the appropriate line, “one” “two” or “three” by pressing 1 FLASH , 2 FLASH , or 3 FLASH accordingly and dial the desired number.
To place a call on any telephone connected to the XLink, simply pick up the handset and dial the number. When dialing out using a cellphone connected to the XLink, an optional # digit may be dialed at the end of the number to activate dialing immediately, the same as SeleCTING lINe the Send button on the cell phone. Dialing a # is not required. The dialing process will start following a short delay after the last digit is dialed.
If connected to the telephone service line (land line) the XLink will dial out from the regular phone using the land line. You can choose to dial out using a cell phone by selecting the appropriate line that is paired to the cell phone you wish to dial out on.
A specific line can be specified on a per call basis by first dialing the desired line number and then pressing the fLAsh key on your telephone.
Example: To specify line 3 for an outgoing call, dial 3 fLAsh , then dial the intended phone number.
If the XLink is not connected to the telephone service line (land line), the XLink uses the lowest line number with a connected (paired) cell phone for outgoing calls. for example, if cell phones for lines 2 and 3 are connected, all outgoing calls will be made on line 2.
Anytime a rapid series of beeps is heard instead of normal dial tone, that specific line (or any line) is not available for outgoing calls. This is because the XLink has not been paired with a cell phone or the cell phone is out of range.
After picking up a telephone connected to the XLink, you should hear a steady dial tone, if you hear an error tone (series of rapid beeps), there are no lines available for an outgoing call. In this case, check to ensure that you have at least one cell phone paired and connected to the XLink. Also check that the telephone service line is connected properly to the XLink.
More information and manual are available at the web site,
http://ww.xlinkgateway.com/
--TonyK.