The following guide will help you to configure your Cisco SPA50xG and SPA303 phone for the C-talk service.  

Step One: Accessing the web config page

1. Make sure the phone is plugged in to your local network, via the port labelled "WAN" or "SW" underneath the phone.  If "piggy-backing" a PC or laptop off the phone, plug your PC or laptop into the "PC" port.
   
2. Now you will need to find out what IP address your phone has been given.  This assumes you have a network with DHCP (most networks).  If you don't, you'll need to assign a static IP to the phone, which is beyond the scope of this document.
   
3. To find out the IP address of the phone, press the Menu button (looks like an A4 page with corner folded over), followed by 9.  The IP address should now display on the screen - write it down.
   
4. Now on your PC (connected to the network also), open up your web browser, and type the IP address in to the address bar and hit Enter (or Go etc).
   
5. You should now be at the configuration page for your phone.  Near the top right-hand corner is a link that says "Admin".  Click that link.  When the page re-loads, click the link beside it that says "Advanced"
   

Step Two: Configuring the phone
Below are listed the values that you should change from the default values.  Any values that are not listed should be left as default.  The headings below relate to "tabs" in the configuration web page.

[System]
Admin password: (type an admin password here if you wish to password protect the setup)
Primary NTP server: nz.pool.ntp.org

[SIP]
Reg max expires = 600
Reg retry interval = 10
Reg retry long interval = 30
RTP packet size = 0.020

[Regional]
Dial tone: 400@-15;30(*/0/1)
Busy tone: 400@-15;*(.5/.5/1)
Reorder tone: 400@-15;*(.25/.25/1+2)
Ringback tone: 400@-15,450@-15;*(.4/.2/1+2,.4/.2/1+2,2,2/0/0)
Call waiting tone: 400@-15;9(.2/3/1,.2/3/1,.2/3/1,.2/0/1)
MWI Dial tone: 400@-15;2.5(.1/.1/1);27.5(*/0/1)
Cadence 1: 60(.4/.2,.4/2)

Vertical Service Activation codes - CLEAR ALL CODES FROM THIS SECTION

Timezone: GMT+12:00
Daylight saving time rule: start=10/1/7/2;3/15/7/3;save=1
Daylight saving enable: Yes

[Phone]
Station name: (your name)
Voice Mail Number: *55

[User]
Date format: Day/month

[Ext 1]
Line enable: Yes
Default ring: (you can experiment with different rings here.  Recommended is 5)
Voicemail server: [your_ph_number]@proxy.c-talk.co.nz     eg. 079291111@proxy.c-talk.co.nz
Proxy: proxy.c-talk.co.nz
Outbound proxy: proxy.c-talk.co.nz
Register expires: 600
Use DNS SRV: Yes

Display name: (your name)
User ID: (your phone number, with area code and without spaces)
Password: (your C-talk password)
Use Auth ID: yes
Auth ID: (your phone number, with area code and without spaces)

Preferred codec: g729a  (or g711 if you have a high bandwidth connection)
DTMF Tx Method: AVT

Dial plan: 
(0[2-9][2-9]xxxxxx|[2-9]xxxxxx|020x.|021x.|0508x.|0800x.|022x.|027x.|028x.|029x.|00x.|1xx|2xx|01x|*x.)

Saving the changes
When done, click "Save All Changes".  
Your phone will restart, and the first line key on the phone should light up green, indicating that the phone has been registered