DrayTek Vigor-2110 Router Manual PDF (Setup & Configuration Guide)

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174

4.11 Certificate Management

A digital certificate works as an electronic ID, which is issued by a certification authority

(CA). It contains information such as your name, a serial number, expiration dates etc., and the

digital signature of the certificate-issuing authority so that a recipient can verify that the

certificate is real. Here Vigor router support digital certificates conforming to standard X.509.

Any entity wants to utilize digital certificates should first request a certificate issued by a CA

server. It should also retrieve certificates of other trusted CA servers so it can authenticate the

peer with certificates issued by those trusted CA servers.

Here you can manage generate and manage the local digital certificates, and set trusted CA

certificates. Remember to adjust the time of Vigor router before using the certificate so that

you can get the correct valid period of certificate.

Below shows the menu items for Certificate Management.

4.11.1 Local Certificate

Generate

Click this button to open

Generate Certificate Request

window.

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Type in all the information that the window requests. Then click

Generate

again.

Import

Click this button to import a saved file as the certification

information.

Refresh

Click this button to refresh the information listed below.

View

Click this button to view the detailed settings for certificate

request.

After clicking

Generate

, the generated information will be displayed on the window below:

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4.11.2 Trusted CA Certificate

Trusted CA certificate lists three sets of trusted CA certificate.

To import a pre-saved trusted CA certificate, please click

IMPORT

to open the following

window. Use

Browse…

to find out the saved text file. Then click

Import

. The one you

imported will be listed on the Trusted CA Certificate window. Then click

Import

to use the

pre-saved file.

For viewing each trusted CA certificate, click

View

to open the certificate detail information

window. If you want to delete a CA certificate, choose the one and click

Delete

to remove all

the certificate information.

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4.11.3 Certificate Backup

Local certificate and Trusted CA certificate for this router can be saved within one file. Please

click

Backup

on the following screen to save them. If you want to set encryption password for

these certificates, please type characters in both fields of

Encrypt password

and

Retype

password

.

Also, you can use

Restore

to retrieve these two settings to the router whenever you want.

4.12 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),

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

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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. Please refer to the

section 4.5.1.

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. Please refer to the

section 4.5.2.

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.

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