DBL Technology EP-636 - Codec Preference; NAT Traversal

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DBL Technology EP-636 User Manual

RTP Port is the target transport address for the RTP audio stream to be sent to.

RTP QOS is a service field in UDP IP packets carrying a RTP data. Enter RTP QOS if your

network supports “DiffServ” and can prioritize the packets to maintain voice quality. It includes

three modes: None, IP TOS and DiffServ. As to TOS Value, there are six kinds: Routing, Priority,

Immediate, Flash, Flashoverride and Critic/Ecp. Differserv Class refers to the following items:

Best Effort, FWD C1 – from Low Drop to High Drop, FWD C2 – from Low Drop to High Drop,

FWD C3 – from Low Drop to High Drop, FWD C4 – from Low Drop to High Drop, and

Expedited FWD.

5.4.3 Codec Preference

Codec preference is the order of voice codec. The default one is up transmitting, which is the set

mode for common users. The below figure is the codec preference configuration page.

5.4.4 NAT Traversal

NAT Traversal can make and receive calls through any type of NAT device. Click “NAT

Traversal” and the following screen will be displayed.

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