Tools > ED137

Apresa supports recording via the ED-137C volume 4 (Recording) standard. Via this page, the service responsible can be configured.

Separate ED137 channel licenses are required.

ED137 Service: Enable or disable the ED137 recording service.

Restart service: Restart the recording service. It is needed to restart the service to apply the changed settings. Ongoing recordings at the moment of restart will be stopped.

RTSP

These settings configure the available transport methods for the RTSP protocol.

TCP: Enable RTSP over TCP.

Port (TCP): Configure which port for RTSP using TCP should be used. The default is port 554.

UDP: Enable RTSP over UDP.

Port (UDP): Configure which port for RTSP using UDP should be used. The default is port 554.

RTP

These settings configure the available transport methods for the RTP protocol. This is the actual audio to be recorded.

UDP: Enable support for sending RTP over an independent UDP connection.

Maximum port and Minimum port (UDP): A UDP port from this range will be allocated for a client to use for RTP

TCP: Enable support for sending RTP over an independent TCP connection.

Maximum port and Minimum port (UDP): A TCP port from this range will be allocated for a client to use for RTP

Interleaved: Enable the use of embedded binary data to reuse RTSP over TCP connections for transport of RTP. This will reuse the RTSP TCP port setting.

RTCP: Enable support for the RTCP protocol, a sister protocol of RTP that allows the recording client to get some feedback about the conditions of the RTP stream.

Metadata

These options control how the metadata received over RTSP is stored in the database in conjunction with the generated audio.

Wait time before stopping recording: This option controls what happens when an ED137 client starts recording and then stops. If the client starts recording again within the time configured here, the old recording will continue.

This means that if multiple shorter recording are made and time between the recordings does not exceed the wait time, the recordings will be combined into one longer recording.

If this option is set to 0 seconds, recording will be stopped immediately once a client stops recording. This means that no such combining of recordings happens.

Add operations as annotations: Specific recording metadata defined by ED137-C has timestamps associated with it.

Enabling this option will store such metadata, also called operations, in the database using the Apresa annotation feature, so that will be associated with a specific timepoint in the recordings.

Other options: The other options in this tab correspond to extra metadata that may be received that will not be stored by the Apresa by default. The Apresa database has several fields that can be used to store arbitrary information.

These are the notes and data fields. With these options, specific metadata can be configured to be stored in one of these fields. To show these fields in the call listings, go to the display settings and enable them the visibility of the columns.

From the display settings, the columns may also be given a display name to match the metadata that is stored. Note that some of this metadata is optional. So if the specific metadata is not received, the field will be left blank.

Compatibility

These options are sometimes needed to get specific recording clients to work correctly.

Allow clients to use same RTSP URL: If multiple clients use the same recording URL, enabling this option still allows the Apresa to differentiate between them as long as every client has a different IP address.

Consistent RTP port: Enabling this option will make the Apresa try to always assign the same port for RTP to the same client.

Enabling this option can help in scenarios were recording clients cannot handle having a different RTP port assigned to them when the RTSP session changes.

Preventing double recordings

N.B.: If both VoIP and ED137 are recorded on the same system, double recordings may be generated. One of the following options can be done:

1. The easiest is to disable raw RTP recording. Go to the system settings, and open the VoIP tab. Here enable the option "Only record RTP in calls".

2. If raw RTP recording is needed from other sources, In the recording settings, use the "Addresses to record" setting to exclude the IP-address of the Apresa itself.

Alternatively, a PCAP filter can be used to more granularly filter out the IP and Port combinations on which the ED137 service receives it's RTP. For more information, consult the manual for the Recording Settings page.