eimmigration's integrations page lists RingCentral under call tracking. Its case records are where staff already work on a client's forms and deadlines, so a call logged there sits with the rest of the file.
Suppose a client phones three times in one week about a pending Form I-485, Application to Register Permanent Residence or Adjust Status. With each call on the case record, the paralegal who picks up the fourth call can see the earlier three. The attorney reviewing the file can see how much contact the case has needed.
In a demo, have the vendor log a call and open the entry. Look for the time, the length of the call, and the staff member, and for where staff add a note about what was said. Place a call from the office as well, to see whether outgoing calls log the same way as calls received. Then have the quote say how the integration is included or charged for. WhatIsBest's comparison of immigration law software for US law firms sets out what each eimmigration plan includes beside the plans of Docketwise and INSZoom.