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44

Enable Dynamic

DNS Account

Check this box to enable the current account. If you did

check the box, you will see a check mark appeared on the

Active column of the previous web page in step 2).

Service Provider

Select the service provider for the DDNS account.

Service Type

Select a service type (Dynamic, Custom or Static). If you

choose Custom, you can modify the domain that is chosen in

the Domain Name field.

Domain Name

Type in one domain name that you applied previously. Use the

drop down list to choose the desired domain.

Login Name

Type in the login name that you set for applying domain.

Password

Type in the password that you set for applying domain.

4.

Click

OK

button to activate the settings. You will see your setting has been saved.

The Wildcard and Backup MX features are not supported for all Dynamic DNS providers. You

could get more detailed information from their websites.

Disable the Function and Clear all Dynamic DNS Accounts

In the DDNS setup menu, uncheck

Enable Dynamic DNS Setup

, and push

Clear All

button

to disable the function and clear all accounts from the router.

Delete a Dynamic DNS Account

In the DDNS setup menu, click the

Index

number you want to delete and then push

Clear All

button to delete the account.

3.4.2 UPnP

The

UPnP

(Universal Plug and Play) protocol is supported to bring to network connected

devices the ease of installation and configuration which is already available for directly

connected PC peripherals with the existing Windows 'Plug and Play' system. For NAT routers,

the major feature of UPnP on the router is “NAT Traversal”. This enables applications inside

the firewall to automatically open the ports that they need to pass through a router. It is more

reliable than requiring a router to work out by itself which ports need to be opened. Further,

the user does not have to manually set up port mappings or a DMZ.

UPnP is available on

Windows XP

and the router provide the associated support for MSN Messenger to allow full

use of the voice, video and messaging features.

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45

Enable UPNP Service

Accordingly, you can enable either the

Connection Control

Service

or

Connection Status Service

.

After setting

Enable UPNP Service

setting, an icon of

IP Broadband Connection on Router

on Windows XP/Network Connections will appear. The connection status and control status

will be able to be activated. The NAT Traversal of UPnP enables the multimedia features of

your applications to operate. This has to manually set up port mappings or use other similar

methods. The screenshots below show examples of this facility.

The UPnP facility on the router enables UPnP aware applications such as MSN Messenger to

discover what are behind a NAT router. The application will also learn the external IP address

and configure port mappings on the router. Subsequently, such a facility forwards packets from

the external ports of the router to the internal ports used by the application.

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The reminder as regards concern about Firewall and UPnP

Can't work with Firewall Software

Enabling firewall applications on your PC may cause the UPnP function not working

properly. This is because these applications will block the accessing ability of some network

ports.

Security Considerations

Activating the UPnP function on your network may incur some security threats. You should

consider carefully these risks before activating the UPnP function.

¾

Some Microsoft operating systems have found out the UPnP weaknesses and hence

you need to ensure that you have applied the latest service packs and patches.

¾

Non-privileged users can control some router functions, including removing and

adding port mappings.

The UPnP function dynamically adds port mappings on behalf of some UPnP-aware

applications. When the applications terminate abnormally, these mappings may not be

removed.

3.5 VoIP

Voice over IP network (VoIP) enables you to use your broadband Internet connection to make

toll quality voice calls over the Internet.

There are many different call signaling protocols, methods by which VoIP devices can talk to

each other. The most popular protocols are SIP, MGCP, Megaco and H.323. These protocols

are not all compatible with each other (except via a soft-switch server).

The Vigor V models support the SIP protocol as this is an ideal and convenient deployment

for the ITSP (Internet Telephony Service Provider) and softphone and is widely supported.

SIP is an end-to-end, signaling protocol that establishes user presence and mobility in VoIP

structure. Every one who wants to talk using his/her SIP Uniform Resource Identifier, “SIP

Address”. The standard format of SIP URI is

sip: user:password @ host: port

Some fields may be optional in different use. In general, "host” refers to a domain. The

“userinfo” includes the user field, the password field and the @ sign following them. This is

very similar to a URL so some may call it “SIP URL”. SIP supports peer-to-peer direct calling

and also calling via a SIP proxy server (a role similar to the gatekeeper in H.323 networks),

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47

while the MGCP protocol uses client-server architecture, the calling scenario being very

similar to the current PSTN/ISDN network.

After a call is setup, the voice streams transmit via RTP (Real-Time Transport Protocol).

Different codecs (methods to compress and encode the voice) can be embedded into RTP

packets. Vigor V models provide various codecs, including G.711 A/μ-law, G.723, G.726 and

G.729 A & B. Each codec uses a different bandwidth and hence provides different levels of

voice quality. The more bandwidth a codec uses the better the voice quality, however the

codec used must be appropriate for your Internet bandwidth.

Usually there will be two types of calling scenario, as illustrated below:

z

Calling via SIP Servers

First, the Vigor V models of yours will have to register to a SIP Registrar by sending

registration messages to validate. Then, both parties’ SIP proxies will forward the

sequence of messages to caller to establish the session.

If you both register to the same SIP Registrar, then it will be illustrated as below:

The major benefit of this mode is that you don’t have to memorize your friend’s IP

address, which might change very frequently if it’s dynamic. Instead of that, you will

only have to using

dial plan

or directly dial your friend’s

account name

if you are with

the same SIP Registrar.

z

Peer-to-Peer

Before calling, you have to know your friend’s IP Address. The Vigor VoIP Routers will

build connection between each other.

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Our Vigor V models firstly apply efficient codecs designed to make the best use of

available bandwidth, but Vigor V models also equip with automatic QoS assurance.

QoS Assurance assists to assign high priority to voice traffic via Internet. You will

always have the required inbound and outbound bandwidth that is prioritized exclusively

for Voice traffic over Internet but you just get your data a little slower and it is tolerable

for data traffic.

3.5.1 DialPlan

This page allows you to set phone book and digit map for the VoIP function. Click the

Phone

Book

and

Digit Map

links on the page to access into next pages for dialplan settings.

Phone Book

In this section, you can set your VoIP contacts in the “phonebook”. It can help you to make

calls quickly and easily by using “speed-dial”

Phone Number

. There are total 60 index entries

in the phonebook for you to store all your friends and family members’ SIP addresses.

Loop

through

and

Backup Phone Number

will be displayed if you are using Vigor 2820V for

setting the phone book.