Man pages matching name rtpbaseudpipv4socket in section 3:

RTPBaseUDPIPv4Socket.3.en	debian 10 / libccrtp-doc
RTPBaseUDPIPv4Socket.3.en	debian 11 / libccrtp-doc
RTPBaseUDPIPv4Socket.3.en	debian 12 / libccrtp-doc