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Page 171 / 298 Scroll up to view Page 166 - 170
igor2930 Series User’s Guide
163
3.10.3 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.
3.11 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
First, the Vigor V models of yours will have to register to a SIP Registrar by sending
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Vigor2930 Series User’s Guide
164
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.
3.11.1 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.
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igor2930 Series User’s Guide
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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 2930V
for setting the phone book.
Click any index number to display the dial plan setup page.
Enable
Click this to enable this entry.
Phone Number
The speed-dial number of this index. This can be any number
you choose, using digits
0-9
and
*
.
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Vigor2930 Series User’s Guide
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Display Name
The Caller-ID that you want to be displayed on your friend’s
screen. This let your friend can easily know who’s calling
without memorizing lots of SIP URL Address.
SIP URL
Enter your friend’s SIP Address
This page will differ for different models. Below is a sample page obtained from Vigor
2930VSn. The selection of
Loop through
and
Backup Phone Number
is only available for
2930VSn model.
Enable
Click this to enable this entry.
Phone Number
The speed-dial number of this index. This can be any number
you choose, using digits
0-9
and
*
.
Display Name
The Caller-ID that you want to be displayed on your friend’s
screen. This let your friend can easily know who’s calling
without memorizing lots of SIP URL Address.
SIP URL
Enter your friend’s SIP Address
Loop through
For the model of Vigor 2930VSn, the selection should be as
the following:
Backup Phone Number
When the VoIP phone is obstructs or the Internet breaks down
for some reasons, the backup phone will be dialed out to
replace the VoIP phone number. At this time, the phone call
will be changed from VoIP phone into PSTN call according to
the loop through direction chosen. Note that, during the phone
switch, the blare of phone will appear for a short time. And
when the VoIP phone is switched into the PSTN phone, the
telecom co. might charge you for the connection fee. Please
type in backup phone number (PSTN number) for this VoIP
phone setting.
Digit Map
For the convenience of user, this page allows users to edit prefix number for the SIP account
with adding number, stripping number or replacing number. It is used to help user having a
quick and easy way to dial out through VoIP interface.
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igor2930 Series User’s Guide
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Enable
Check this box to invoke this setting.
Prefix Number
The phone number set here is used to add, strip, or replace the
OP number.
Mode
None
- No action.
Add
- When you choose this mode, the OP number will be
added with the prefix number for calling out through the
specific VoIP interface.
Strip
- When you choose this mode, the OP number will be
deleted by the prefix number for calling out through the
specific VoIP interface. Take the above picture (Prefix Table
Setup web page) as an example, the OP number of
886
will be
deleted completely for the prefix number is set with
886
.
Replace
- When you choose this mode, the OP number will be
replaced by the prefix number for calling out through the
specific VoIP interface. Take the above picture (Prefix Table
Setup web page) as an example, the prefix number of 03 will
be replaced by 8863. For example: dial number of
“031111111” will be changed to “88631111111” and sent to

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