SIP setting information from support article https://support.ringcentral.com/article-v2/Setup-Algo-SIP-Endpoints-as-a-Paging-Device-RingCentral.html?brand=RC_US&product=RingCentral_MVP&language=en_USSeem inaccurate as customer was able to provisioned his paging device using sip.ringcentral.com:5090 instead of port 5060 as per article and SIP generated setting from Service Web.