Parameter: Allow low-delay media relay

Allow low-delay media relay (without transcoding) between two joined legs.

This mode is only available on SBC units (not on TMG units).

The low-delay media relay mode eliminates any VoIP audio delay caused by the SBC for IP to IP calls, by eliminating the need for jitter buffer, de-packetization and re-packetization. With low-delay mode, packets get routed directly from one leg to the other with 0ms delay.

When this mode is enabled in a profile, it will be effective only if:

• Both joined call legs use NAPs where the RTP port ranges are on SBC-protected VLANs
• Both call legs have been able to negotiate a compatible audio codec
• No IVR is required (play file, record file, play tone or detect tone).

Enabling the low-delay mode will also allow a variant: Use the RTP no-anchoring mode.