Reference13r1:Gateway/Interfaces/Media Properties

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Media Properties

The physical interface may be registered using H.323 or SIP. For the VOIP call the media properties can be configured.

General Coder Preference
The coder preference (Coder, Framesize, Silence Compression) to be used if a non-local media address is detected. If the preference is marked as exclusive no other coder is offered.
Local Network Coder
The coder preference if a local media address is detected.
Enable T.38
Switches on Fax detection and switchover to T.38
Audio FAX support
Switches on voice coder e.g. G.711 for the FAX interface. This feature requires two free DSP channels and is not available on IP2x, IP302, IP305, IP800, IP0011, IP311 gateways and IPVA.
No DTMF Detection
Special mode to switch off DTMF detection during a call. If checked DTMF is transferred inband during a call. Use G711 coder and a link with no packet loss to transfer DTMF inband. This option can be used to transfer continuous DTMF tones for some special applications. Out of band DTMF tones have a fixed length of approx 150ms.
Enable PCM
Enable the media to be connected using the local timeslot switch if the call is between physical interfaces of the same gateway.
No Media Relay is performed for calls thru this interface
If the interface of one call leg is set to Media-Relay On, Media relay is performed
If the interfaces of both call legs are set to Media-Relay Auto, Media Relay is performed if the call is between a private an a public network, based on the private network configurations under IP4/General/Settings
If this checkmark is set, Video Media Relay is also done.
ICE is turned off for calls routed through this interface
RTCP-MUX(RTP and RTCP share the same port/connection, instead of using two separate connections) is turned off for calls routed through this interface
Do not offer real local RTP address (a.k.a. HOST candidate). Offer remote RTP address only (a.k.a. RELAY candidate). You may enable this option for "Topology Hiding" purposes. Note: This can cause 'no-audio' calls if the remote peer does not support ICE (RFC 5245)
MOH Mode
Special mode to use a physical interface as Music on Hold Source. The media is one way only and multiple calls are connected to the same channel on the physical interface. In this case the configured coder is used exclusively, even if not marked as exclusive.
Record to (URL)
HTTP URL where the recording file is to be stored. HTTP server must allow write access (PUT) at this location. One PCAP file is written for every call via this interface containing both RTP streams. Audio streams can be played using Wireshark. PCAP file can be converted into WAV file using pcap2wav tool. The filename of the recording file has the form <conference ID>-<mac>-<seq>.pcap
conference ID
A guid identifying the call across different hops. It is forwarded within the signaling. The CDRs generated by the PBX contain this conference ID.
The Mac address of the device recording the call. Together with seq it is used to make sure the filename is unique if seperate devices record the same call.
A sequence number of the record starting with 0 after power up of the recording device. Together with mac it is used to make shure the filename is unique, especially to cover the case, that one device records the same call multiple times (e.g. incoming and outgoing)
SRTP Cipher
The encryption mode for RTP
SRTP Key Exchange
SDES and DTLS are supported. The preference is SDES
SDES and DTLS are supported. The preference is DTLS
SDES only
DTLS only
No encryption