Integrations / Business phone systems and carriers
Use AssistCall with Grasshopper
Keep your Grasshopper 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.
Grasshopper: Virtual phone system that adds a business number, extensions and a greeting menu on top of the owner's existing mobile or landline.
Connects
Example call
A caller picks 'new customers' on a consultant's Grasshopper menu at 7 pm. The extension's AssistCall forwarding number is in its hours, so the receptionist books an intro call and emails the consultant the summary.
- Add your AssistCall number as a forwarding number on your main extension with evening and weekend hours, so after-hours callers are answered instead of reaching voicemail.
- Give a sales or bookings extension an AssistCall forwarding number so callers who pick that menu option can book without waiting for you.
- Get each answered call's summary, transcript and recording link by email, then call back from your Grasshopper number.
How it connects
- Call forwarding: Forward your business line to AssistCall when busy, after hours or always. Works with any carrier.
About Grasshopper's API
- No public API
- Style: No public API found
- Authentication: Not applicable
- On Zapier: no. On Make: no.
We found no public developer API, and no Zapier or Make app for Grasshopper. Grasshopper already works by forwarding: each extension rings one or more forwarding numbers, and each forwarding number has its own 'call forwarding hours' inside the extension's office hours. Add your AssistCall number as a forwarding number on an extension and give it the hours you want it to answer. Account-level business hours come first: outside them callers hear the away greeting, so keep those hours open for any time you want AssistCall to answer. If every forwarding number is outside its hours, the call goes to extension voicemail.
Not included: no one-click Grasshopper app, no listing in Grasshopper's marketplace, no two-way sync, and no partnership with GoTo.
Researched by the AssistCall team and checked against GoTo's public pages on October 24, 2026. Grasshopper is a trademark of GoTo. AssistCall is an independent product of Starling Global LLC and is not affiliated with, endorsed by, sponsored by or approved by GoTo.
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.