Hi nasser,
You can connect a phone number using a SIP trunk to Vapi. However, if you're looking to use a UAE phone number and GSM gateway directly, Vapi requires integration through a SIP provider since direct GSM gateway integration isn't supported. Consider getting a SIP trunk from a provider that supports UAE numbers and then configure it with Vapi as documented in the [SIP Trunking Guide](
https://docs.vapi.ai/advanced/sip/sip-trunk). This guide covers how to set up and configure your SIP trunk for both inbound and outbound calls.