Installing the VoIP V2 Loudspeaker Amplifier
Configure the Loudspeaker Amplifier Parameters
Operations Guide
930361G
CyberData Corporation
37
2.3.8.1 Assigning Priority
When playing multicast streams, audio on different streams will preempt each other according to
their priority in the list. An audio stream with a higher priority will interrupt a stream with a lower
priority.
If both SIP and Multicast is enabled, SIP audio streams are considered priority
4.5
. SIP audio will
interrupt multicast streams with priority
0
through
4
and will be interrupted by multicast streams
with priority
5
through
9
.
During priority
9
multicast streams, the analog volume control is bypassed and the volume level is
set to maximum.
Line In audio is considered the lowest priority, so it will be muted if there are any multicast or SIP
audio streams playing.
For example, if the test audio button on the Device Config page is pressed while music is playing via
the Enabled Line In feature, the music will be muted during the test audio message.
Note
SIP calls, buffered SIP calls, multicast streams, buffered multicast streams, ring tones,
ringback tones, and nightring tones are all prioritized.
Ringtones and
Nightringtones
Ringtones all play at the same priority level. This means that it is possible to have a nightring tone
and a normal ringtone playing at the same time.
The maximum ringtone duration is 2,097,152 bytes or about four minutes of ulaw audio.
Lengthy Pages
Concerning how lengthy pages are handled (where someone puts the phone down for 15 minutes),
after the 2MB limit is reached, further data will be thrown away while the audio file is played back.
When the file is done playing, it will stop throwing away input and begin buffering data for another
four minutes.
Therefore, with the buffered mode enabled on a stream playing background music, you will hear the
following sequence of events:
1. Four minutes of silence.
2. Music from 0:00 through 4:00.
3. Four minutes of silence.
4. Music from 8:00 through 12:00 and so on.
Buffered Audio
When the device is playing back buffered audio and this buffered audio is interrupted by a higher
priority stream, once the higher priority streams is finished, the device will restart the lower priority
stream from the beginning.
