Different ring-tone for specific incoming numbers

[belias]

Hello,

I support a system with 2 W52P base stations configured as:

Base 1: 3 handsets, 3 lines
Base 2: 2 handsets, 2 lines

The customer frequently needs to "intercom" between bases. The only way I could set this up was to simply use the phone-book and list the other extensions. Not exactly "intercom", but best I could come up with since the Yealink intercom feature doesn't work between bases.

This works, but they need a different ring-tone for these types of calls vs. a regular incoming call. Is there any way to support this?

Thanks.