Integrations / Business phone systems and carriers
Use AssistCall with Google Voice
Keep your Google Voice number. Forward it to AssistCall when you're busy, don't pick up or after hours, and every call gets answered, booked or turned into a message, with a summary by email.
Google Voice: Google's phone service for Google Workspace businesses (Starter, Standard and Premier plans), with a business number that rings on phones, laptops and the Voice app.
Connects
Example call
A caller dials a consulting firm's Google Voice number at 8 pm. The automated attendant's after-hours action transfers the call to AssistCall, which books a discovery call, and the owner gets the summary in Gmail.
- Set the automated attendant's after-hours action to transfer callers to your AssistCall number, so evening and weekend calls get answered (Voice Standard or Premier).
- Add a menu option such as 'press 2 to book an appointment' that transfers to AssistCall during open hours, so booking calls don't tie up staff.
- Get each call's summary, transcript and recording link in your Gmail inbox, next to the rest of your Google Workspace mail.
How it connects
- Call forwarding: Forward your business line to AssistCall when busy, after hours or always. Works with any carrier.
About Google Voice's API
- No public API
- Style: None for routing or placing Google Voice calls
- Authentication: Not applicable
- On Zapier: no. On Make: no.
No public API for Google Voice calls, and no Zapier or Make app for Google Voice was found. Google says forwarding Google Voice calls to an automated system through linked numbers isn't supported, so don't add AssistCall as a linked number. The supported route is an automated attendant (Voice Standard and Premier only): in the Admin console, set open hours, and for the after-hours action choose 'Transfer the caller' with transfer type 'Phone number' and your AssistCall number. A menu option can also transfer to a phone number during open hours. Voice Starter has no automated attendant. We found no setting to forward a single user's unanswered calls to an outside number.
Not included: no one-click Google Voice app, no listing in Google Voice's marketplace, no two-way sync, and no partnership with Google.
Researched by the AssistCall team and checked against Google's public pages on October 24, 2026. Google Voice is a trademark of Google. AssistCall is an independent product of Starling Global LLC and is not affiliated with, endorsed by, sponsored by or approved by Google.
More Business phone systems and carriers integrations
- AT&T Business: AT&T's business wireless, fiber and phone service, which many small businesses use for the mobile or landline number printed on their trucks, cards and listings.
- Comcast Business: Comcast's internet and business phone service (Business Voice and VoiceEdge) for offices, shops and restaurants in its cable footprint.
- RingCentral: Cloud business phone system (RingEX) with calling, texting, video and team chat in one app, used by small offices up to large companies.
- Spectrum Business: Charter's internet, mobile and business phone service (Spectrum Business Voice) for small businesses in Spectrum service areas.
- T-Mobile for Business: T-Mobile's wireless and internet service for small businesses, often the owner's mobile number doubling as the business line.
- Verizon Business: Verizon's business wireless, internet and phone service, used by many small businesses whose main number is an owner's or staff member's Verizon mobile line.
All product and company names in this directory are trademarks or registered trademarks of their respective owners, used only to identify systems AssistCall can send call information to or receive information from. Their use does not imply any affiliation with or endorsement by their owners. AssistCall connects using signed webhooks, the business's own API keys, automation platforms (Zapier, Make, n8n) the business sets up in its own account, and call forwarding. AssistCall does not provide one-click connectors, marketplace apps, certifications or two-way record or calendar sync, and does not sign HIPAA business associate agreements. Vendor features, plans and API access can change; information last checked October 24, 2026.