ZyXEL Communications p-2612HNU-FX Manuel D’Utilisation

Chapter 9 Voice

P-2612HNU-Fx User’s Guide

Dual-Tone MultiFrequency (DTMF) signaling uses pairs of frequencies (one lower 
frequency and one higher frequency) to set up calls. It is also known as Touch 
Tone®. Each of the keys on a DTMF telephone corresponds to a different pair of 
frequencies.

Pulse dialing sends a series of clicks to the local phone office in order to dial 
numbers.

1

Enable Message Waiting Indication (MWI) enables your phone to give you a 
message–waiting (beeping) dial tone when you have a voice message(s). Your 
VoIP service provider must have a messaging system that sends message waiting 
status SIP packets as defined in RFC 3842.

Quality of Service (QoS) refers to both a network's ability to deliver data with 
minimum delay, and the networking methods used to provide bandwidth for real-
time multimedia applications. 

Network traffic can be classified by setting the ToS (Type of Service) values at the 
data source (for example, at the ZyXEL Device) so a server can decide the best 
method of delivery, that is the least cost, fastest route and so on. 

DiffServ is a class of service (CoS) model that marks packets so that they receive 
specific per-hop treatment at DiffServ-compliant network devices along the route 
based on the application types and traffic flow. Packets are marked with DiffServ 
Code Points (DSCP) indicating the level of service desired. This allows the 
intermediary DiffServ-compliant network devices to handle the packets differently 
depending on the code points without the need to negotiate paths or remember 
state information for every flow. In addition, applications do not have to request a 
particular service or give advanced notice of where the traffic is going.

2

1.

The ZyXEL Device does not support pulse dialing at the time of writing.

2.

The ZyXEL Device does not support DiffServ at the time of writing.