A2P approved for missed call text back — implied consent — anyone solved this?

Hey everyone! Just joined the community and based in Ottawa Canada.

I run a done-for-you missed call SMS recovery service for local trades and service businesses (electricians, HVAC, plumbers, salons) built on GHL.

My A2P campaign has been rejected 3 times with error code 30909 — CTA verification issue.

Here's my problem: my consent model doesn't fit the standard framework. The flow is simple — end user calls a local business, nobody answers, they get an automated text back within seconds. There's no web form because the customer never visits a website. They just called.

I can't add a "reply YES first" step because trades customers will just call the next business on Google. It defeats the whole purpose.

My questions for anyone who's solved this:

Have you gotten A2P approved for a missed call text back use case where there's no web form opt-in?
What opt-in method did you select and what did you write in the consent description?
Did registering under a different use case category make a difference?
Is toll free verification an easier path for this specific use case?

Any help massively appreciated 🙏

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