docs: clarify LCR OSS options (#4808)

# What this PR does
Updates the SMS & call routing tutorial to address OSS usage options and
requirements.

## Which issue(s) this PR closes
[Issue #21169](https://github.com/grafana/website/issues/21169)
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@ -14,6 +14,15 @@ canonical: https://grafana.com/docs/oncall/latest/configure/live-call-routing/
aliases:
- /docs/grafana-cloud/alerting-and-irm/oncall/configure/escalation-chains-and-routes/
- ../live-call-routing/ # /docs/oncall/<ONCALL_VERSION>/escalation-chains-and-routes/
refs:
open-source:
- pattern: /docs/oncall/
destination: /docs/oncall/<ONCALL_VERSION>/set-up/open-source/
- pattern: /docs/grafana-cloud/
destination: /docs/grafana-cloud/alerting-and-irm/oncall/set-up/open-source/
irm-invoice:
- pattern: /docs/grafana-cloud/
destination: /docs/grafana-cloud/cost-management-and-billing/understand-your-invoice/irm-invoice/
---
# Configure SMS & call routing with Grafana OnCall
@ -27,10 +36,18 @@ You can further customize your configuration to send different alerts to differe
To complete the steps in this guide, ensure you have the following:
- Grafana Cloud account: If you haven't already, [sign up for Grafana Cloud](https://grafana.com/auth/sign-up/create-user).
- For Grafana Cloud users: A Grafana Cloud account. If you haven't already, [sign up for Grafana Cloud](https://grafana.com/auth/sign-up/create-user).
- For OSS users: Notification routing must be configured using either Grafana Cloud or a third-party provider, such as Twilio.
Refer to the [Grafana OnCall open source guide](ref:open-source) for more information.
- Grafana OnCall user with administrator privileges and notification settings configured.
- Twilio account: [Sign up for Twilio](https://www.twilio.com/try-twilio).
{{< admonition type="note" >}}
While OSS users have the option to use Grafana Cloud for phone and SMS routing, it is not required.
If you decide to use Grafana Cloud for notification delivery, be aware that charges may apply.
For more information, refer to our [billing documentation](ref:irm-invoice).
{{< /admonition >}}
## Basic set up
In the basic set up, you'll create an integration in OnCall and configure a phone number in Twilio.