222RFC3263(sip) SIP的RFC文档。RFC3263. RFC3263-SIP RFC documents. RFC3263. RFC3263 2024-01-11 2 SIP+phone
444RFC3621(sip) SIP的RFC文档。RFC3621. RFC3621-SIP RFC documents. RFC3621. RFC3621 2024-01-11 1 SIP+phone