1. Home
    2. /
  2. Manuals
    3. /
  3. Linksys
    4. /
  4. SPA-841
    5. /
  5. 34
Page 166 / 286 Scroll up to view Page 161 - 165
Localization
Localizing the SPA400 Caller ID Method
SPA9000 Voice System Administration Guide
164
8
NOTE
In the United Kingdom, choose UK BT or UK CCA. In the rest of Europe,
choose European (FSK).
STEP 4
Click Save Settings.
STEP 5
To restart the SPA400, complete the following tasks:
a.
Click Administration > Reboot.
b.
Click the Restart button.
c.
When the confirmation message appears, click OK. The SPA400 reboots.
d.
When the
Reboot OK
message appears, click OK.
STEP 6
To verify your progress, make a call from outside to any of the PSTN lines
connected to the SPA400 (make sure that CID is enable in your PSTN line). In the
ringing SPA phone display you should now be able to see the number from the
calling number.
Downloaded from
www.Manualslib.com
manuals search engine
Page 167 / 286
A
SPA9000 Voice System Administration Guide
165
Advanced Topics in SPA9000 Administration
This appendix provides more detailed technical information for administrators who
want to understand how the SPA9000 Voice System works.
•
“Technology Background,” on page165
•
“SPA9000 Architecture,” on page170
•
“SIP-NAT Interoperation,” on page172
•
“Advanced Call Control and Routing,” on page173
•
“Configuring Vertical (Supplementary) Service Codes,” on page173
•
“Advanced Topics for SPA400 Voice Mail Service,” on page178
•
“Remote Provisioning Features,” on page183
Technology Background
This section provides background information about the technology and protocols
used by the SPA9000 system. It includes the following topics:
•
“Session Initiation Protocol,” on page166
•
“SPA9000 Media Proxy,” on page167
•
“Using the SPA9000 with a Firewall or Router,” on page168
•
“SPA400 SIP-PSTN Gateway,” on page169
Downloaded from
www.Manualslib.com
manuals search engine
Page 168 / 286
Advanced Topics in SPA9000 Administration
Technology Background
SPA9000 Voice System Administration Guide
166
A
Session Initiation Protocol
The SPA9000 Voice System is implemented using open standards, such as
Session Initiation Protocol (SIP), allowing interoperation with all ITSPs supporting
SIP. The following figure illustrates a SIP request for connection to another
subscriber in the network. In the SIP protocol, the requestor of the session is
called the user agent server (UAS), while the receiver of the request is called the
user agent client (UAC).
Figure 1
SIP Requests and Responses
NOTE
In this manual, the term client station is used to describe any SIP UA (including IP
phones) that registers with the SPA9000.
In a SIP VoIP network, when the SIP proxy receives a request from a client station
(UAS) for a connection and it does not know the location of the UAC, it forwards
the message to another SIP proxy in the network. Once the UAC is located and the
response is routed back to the UAS, a direct peer-to-peer session is established
between the two UAs. The actual voice traffic is transmitted between UAs over
dynamically assigned ports using the Real-time Protocol (RTP).
In the following figure, UserA and UserB are client stations (UAs) that register over
the local area network to which the SPA9000 PBX is connected. When UserA calls
UserB, the SPA9000 acts as a SIP proxy and establishes a session between the
two UAs. After the session is established, RTP traffic flows directly between the
two client stations.
SIP UA
SIP UA
SIP Proxy
SIP Proxy
RTP
1
2
3
4
SIP Proxy
Downloaded from
www.Manualslib.com
manuals search engine
Page 169 / 286
Advanced Topics in SPA9000 Administration
Technology Background
SPA9000 Voice System Administration Guide
167
A
Figure 2
SPA9000 as a SIP Proxy
When a user picks up the handset in an SPA9000 Voice System, the SPA9000
collects DTMF digits from a touchtone analog telephone or the locally connected
SPA900 Series IP phones. Unless the call is for a local client station, the SPA9000
system sends the full number in a SIP INVITE message to another SIP proxy server
for further call processing.
To minimize dialing delay, a dial plan is maintained that is matched against the
cumulative number entered by the user. Invalid phone numbers that are not
compatible with the dial plan are detected and the user is alerted using a
configurable tone (reorder) or announcement.
The figure also illustrates connectivity between the SPA9000 and the ITSP over
the Internet. When UserA calls UserC, the SPA9000 directs the request to the SIP
proxy at the ITSP, which is then responsible for routing the request to UserC. Even
after the SIP session is established, the SPA9000 continues to direct RTP packets
between UserA and the ITSP.
SPA9000 Media Proxy
To address this possible security issue, the SPA9000 can also function as a media
(RTP) proxy. This option forces RTP traffic destined for the Internet (or IP WAN) to
be directed to the SPA9000, which then directs it to the remote UA. This
configuration may simplify firewall configuration because the client stations do not
require direct access to the Internet through the firewall.
SIP Proxy with
media proxy enabled
Internet
IP Router (firewall)
Broadband modem
Hub/switch
SPA9000
UserA
UserB
UserC
Internet (WAN)
Interface
ITSP
ISP
Downloaded from
www.Manualslib.com
manuals search engine
Page 170 / 286
Advanced Topics in SPA9000 Administration
Technology Background
SPA9000 Voice System Administration Guide
168
A
To enable the media proxy, go to the
Voice > SIP
page,
PBX Parameters
section,
and set the
Force Media Proxy
parameter to
True
. With the media proxy enabled,
when UserA calls User C, the SPA9000 still acts as the SIP proxy and forwards the
request to the SIP server on the ITSP. However, even after the SIP session is
established, the SPA9000 continues to direct RTP packets between UserA and
the ITSP.
Local traffic is not affected by this configuration. When UserA initiates a call to
UserB, RTP traffic still flows directly between the two UAs. The media proxy only
affects RTP traffic to a UA connected through the ITSP.
Using the SPA9000 with a Firewall or Router
When using the
SPA9000
behind a firewall or router, make sure that the following
ports are not blocked:
•
SIP ports—By default, UDP ports 5060 through 5063
•
RTP ports—16384 to 16482
Also disable SPI if this function exists on your firewall.
Downloaded from
www.Manualslib.com
manuals search engine

Rate

3.5 / 5 based on 2 votes.

Popular Linksys Models

Famous Router IPs
Famous Router Companies
Bookmark Our Site

Press Ctrl + D to add this site to your favorites!

Share
Top