Cisco SPA 303
 Configuring from fresh
Setting up one of these units is nice and easy. All you need to do is make sure you are in the Advanced View of Admin Mode.
Once you are in the advanced view of Admin Mode, the two pages that need your attention are the System page and the EXT # Pages.
 Important update
There have been some quality issues on this phone which have come to light.
They require some settings to be set to ensure they choose the correct voice settings to work.
- NAT mapping enable = yes
- SIP port should be some random high value (pick some number between 49152 and 65535) - this just helps some firewalls
- RTP parameters
- Port range = 10000=>20000
- RTP Packet size = 0.020
- Symmetric RTP = yes
 System Page
On the system pages, you only need to fill in the Domain,Primary DNS, and Secondary DNS. Use Google DNS for the primary and secondary, and the domain is whatever you set it up as. For example mydomain.babblevoice.com.
 Extension # page
For a pleasant experience with setting up your phone, I advise you copy the drop down settings like for like, just as they are displayed below.
the other important settings are as follows:
Outbound Proxy: mydomain.babblevoice.com
Display Name: John Smith
User ID: Your extension number (1000)
Password: Your extensions secret
Auth ID: Your extension number (1000)