Assume the remote side supports RFC 3264 style hold when a=sendrecv is missing in SDP. When set to off, the phone will signal hold as specified in RFC 2543 when the remote side's SDP is missing the a=sendrecv attribute, i.e. by setting the IP in the SDP to 0.0.0.0.
...
N/A
| Parameter | Valid value |
|---|---|
| <remote_3264_hold perm="PERMISSIONFLAGS">VALIDVALUE</remote_3264_hold> | on off |