The username parameter contains the originator’s login or host.
The session-id parameter is a Network Time Protocol (NTP) timestamp or a random number used to ensure uniqueness.
The version is a numeric field that is increased for each change to the session, also recommended to be a NTP timestamp.
The network-type is always IN for the Internet. The address-type parameter is either IP4 or IP6 for IPv4 or IPv6 address either in dotted decimal form or a fully qualified hostname.
Sometimes we manually modify some SDP, the session ID is not set to a different value. the EHX editor has no warning, but the EHX log will show timeout- BACH responses is slow. there will be no RX streams are decoded.
This gives the length of time in milliseconds represented by
the media in a packet. This is probably only meaningful for
audio data, but may be used with other media types if it makes
sense. It should not be necessary to know ptime to decode RTP
or vat audio, and it is intended as a recommendation for the
encoding/packetisation of audio. It is a media-level
attribute, and it is not dependent on charset.
For CC we only use ptime of 1 (1ms) or 0.125 (125us)