Hi,
if you need additional digits (for example a "0") in front of the CallingID of the person who tried to call you to make an easy call return from the missed calls page on a SPA phone on the UC320W, then you can create a Transformation Rule in the Mediatrix ISDN Gateway to add this steering digit.
In myspecific example calls coming in the UC320W in the format:
06196 7739800
area code and local number
To dial this number back from UC320W I need to dial:
0 06196 7739800
i.e. i need to add a '0' to get an outside line and then dial area code '06196' and local number '7739800'.
You can have the Mediatrix to add a leading 0 for all incoming ISDN calls. That makes call return easy.
Here is the screenshot from the Mediatrix config page:
Step 1: Add a Mapping Type: I called it "Add0" with the transformation Calling E164 to Calling E164
Step 2: Add a Mapping Expression with the same name "Add0" and transform .+ to 0\0
( \0 means take the whole string , and 0\0 means take the whole string and prepend a zero)
Step 3: Add the mapping type to the incoming calls (in my case i Use only BRI3 so I added it to the isdn-Bri3 to sip-UC320 route)
Let me know if this works for you
Jo
NB: For SIP calls you might want to ask your SIP service provider if he can add the 0 for you.