Yealink SIP-T27P User Manual page 172

User Guide for the SIP-T27P IP Phone
The sender's phone places the multicast RTP session on hold and receiver's phone
releases the session.
To resume the held multicast RTP session, press the Resume soft key.
The multicast RTP session is established again.
To end the multicast RTP session, press the End Call soft key.

Note
Multicast RTP is one way only from the sender to the multicast address(es) (receiver). For
outgoing RTP multicasts, all other existing calls on the phone will be placed on hold.
To send RTP stream via a paging list key when the receiver's phone is idle:
Press the paging list key when the phone is idle.
1.
Press or
2.
Press or the Paging soft key to send RTP.
3.
Your can do the following:
4.
To place the current multicast RTP session on hold, press the Hold soft key.

The sender's phone places the multicast RTP session on hold and receiver's phone
releases the session.
To resume the held multicast RTP session, press the Resume soft key.
The multicast RTP session is established again.
To end the multicast RTP session, press the End Call soft key.

160
to select the desired paging group.