We have about 50 of them deployed to date. They work really great and have a bunch of flexible connectivity options. In our case, we use them to connect radios at remote locations back to our dispatch console system over VPN internet connections (via SIP). But if all you want to do is patch two radios together, it'll do that easily. The basic model with 2 radio ports activated runs about $2622.
Hint: you can buy the radio interface cables from them, or just go to the source and save some money.
Hall Electronics Inc.
https://www.hallelectronics.com/ They average about $125 each.