remove custom SIP trunking from enterprise-only features

Author: humford

fern/enterprise/plans.mdx

@@ -16,7 +16,6 @@ On the Pay-As-You-Go plan, there is a limit of **10 concurrent calls**. On Enter
 - Shared Slack channel with our team
 - Included minutes with volume pricing
 - Calls with our engineering team 2-3 times per week
-- Access to the Vapi SIP trunk for telephony
 
 ## Contact us