1) Configure the fritz: Knowledge document #42
N.B: The guide is identical for any fritzbox, in particular if your fritzbox already has your operator's VoIP configuration, the steps to follow are 2-3-4 (For those who want to, just change the URL to your fritzbox model to get the guide in your manual)
2) Configure the Cisco SPA303:
Menu "SIP":
Linksys Key System Parameters / Linksys Key System: No
Linksys Key System Parameters / Key System Auto Discovery: No
Menu "Regional":
Miscellaneous / Ignore DHCP Time Offset: Yes
Menu "Ext 1 " (for line 1 ):
Proxy e Registration / Proxy: fritz.box (alternatively the IP address of the router)
Proxy and Registration / Register Expires: 600
Subscriber Information / Display Name: Private (any name)
Subscriber Information / User ID: (the user name set by Fritzbox)
Subscriber Information / Password: (the associated password)
Audio Configuration / G722 Enable: No
Audio Configuration / Preferred Codec: G711u
Audio Configuration / Second Preferred Codec: G711a
Audio Configuration / Third Preferred Codec: G726-40
Audio Configuration / DTMF Process AVT: No
Dial Plan / Dial-Plan:
(**x|*xx|**xxx|[3469]11|0|00|[2-9]xxxxxx|1xxx[2-9]xxxxxxS0|xxxxxxxxxxxx.)
Menu "Phone":
Line Key 1 - Extension:
1 (assigns the first line [Ext1] to the top button on the phone)
Line Key 1 - Short Name:
Name displayed next to the light button
(optional, otherwise there is the Fritzbox login name [$USER])
All other parameters can be left at the default settings.N.B: The line key settings at the end are the three illuminated keys for the telephone lines, 3 line keys, you can disable them from the drop-down menu "Extension:" put disabled, otherwise the small numbers 1,2,3 indicate the telephone line configured in ext1,2,3 and therefore a link is created between the chosen line and the key, by disabling it the key light will go out
This is not an official guide, fritzbox or cisco did not work on this guide, Fritzbox is a trademark of AVM GmbH · Image by IGN Italy