Mobile CRM: alternative VOIP

I use the CRM app on Android. It's great that I can call contacts with one click and be able to put the results in teh timeline whilt away from my desk.

However, I use a voip service (Vonage extensions) for business calls, particularly for overseas calls. It would be great to have the option of calling on that service, not just the standard phone dialer.

HubSpot updates