Attachments have file size limits. While we would still encourage keeping file sizes small, if you do need to send a larger file, attachments have file size limits. For files larger than 10MB using a link should be a rule. Attachments can use up a lot of storage.
Welcome to TDOP. The Teaching Dimensions Observation Protocol (TDOP) is a customizable observation protocol can be used to produce robust and nuanced depictions of the dynamics that unfold among teachers, students, and technologies in the classroom.
SIP, the session initiation protocol, is the IETF protocol for VOIP and other text and multimedia sessions, like instant messaging, video, online games and other services.Abstract from the RFC 3261 (formatted_and_explained version) - SIP: Sessio