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This is the support site for Andrews & Arnold Ltd, a UK Internet provider. Information on these pages is generally for our customers but may be useful to others, enjoy!

VoIP Phones - FritzBox

Back up to the VoIP Configuring page
From AAISP Support Site


New lines are configured via the Telephony > Phone Numbers > New Phone Number wizard, however not all options are visible until the SIP account is saved for the first time.

FRTIZ!Box Configuration (FRITZ!OS 8.2x)
Section Setting Value
Account Information Use internet phone number Checked
Telephony provider Other provider
Phone number for registration Your Number (+44...)
Internal phone number in the FRITZ!Box Your Number (with trunk prefix/leading 0)
Display Name (blank)
Username Your Number
Authentication name
Password Your Password
Registrar voiceless.aa.net.uk
Proxy server (blank)
STUN server
Phone Number Format Precede the number dialled with these prefix numerals: Country code: None

Area code(*): None

Relay outgoing emergency calls without prefixes Checked
Relay special rate numbers without prefixes Checked
Relay local phone number in international phone number format Checked
Additional Settings for the Phone Number DTMF transmission Automatic
Suppress outgoing Caller ID CLIR via display name
Caller ID Disabled
Provider supports G.726 in accordance with RFC 3551 Unchecked
Provider supports call-back on busy (CCBS) in accordance with RFC 4235 Unchecked
Provider supports forwarding of calls during the calling phase Unchecked
Packet size in milliseconds in send direction 20
Additional Settings for the Connection Use phone number for registration Checked
Always register via an internet connection Checked
Contact telephone provider via IPv4 and IPv6, IPv6 preferred
Transport protocol Automatic
The provider supports encrypted telephony via SRTP in accordance with RFC 3711 and RFC 4568 Checked
Media protocol RTP/AVP and RTP/SAVP
Provider supports MediaSec Extension Unchecked
Provider supports MWI (RFC 3842) Unchecked
Provider does not support REGISTER-fetch Unchecked

(*) The parameter Insert area code for outgoing calls in the wizard is shortened just to Area code in subsequent menus.

FRITZ!OS device or version-specific info

FritzOS 7.57 with A&A VoIP, all works fine.

Some notes fritzbox 7530, taken (with thanks!) from: https://forums.thinkbroadband.com/voip/t/4749882-re-aa-voip-with-fritzbox-7530.html

Settings as follows:

Under "Telephony -> Telephone Numbers" you will need an entry for A&A, which should look like: 

Status Telephone Number Provider Preselection
(green dot) 01yyyxxxxxx voiceless.aa.net.uk* *123#

I obscured our phone number, under "Status" you should see a green dot if successfully registered, the *123# is put in there by the Fritzbox, no need to set that up yourself.

There is an "edit" and "delete" button to the right. Once you click "edit" you see another page "Edit Telephone Number". Here I have got:

under Account Information
  • Use internet telephone number checked
  • Telephony provider Other provider
Telephone number for registration
  • your number in international format, I have +441268xxxxxx
  • Internal telephone number in the FRITZ!Box** not really important, I have 01268xxxxx
  • Display name (leave blank)
under Account Information
  • Username, Authentication name, Password as supplied by A&A
  • Registrar voiceless.aa.net.uk
  • Proxy server (leave blank)
  • STUN server (leave blank)

under Telephone Number Format

  • Precede the number dialed with these prefix numerals:
  • Country code select With prefix (0044)
  • Area code select Without prefix (1268)
  • Relay outgoing emergency calls without prefixes checked
  • Relay special rate numbers without prefixes checked

the rest in this section is blank/unchecked

under Additional Settings for the Telephone Number
  • DTMF transmission RTP or Inband
  • Suppress outgoing Caller ID (CLIR) CLIR via display name
  • Caller ID disabled
  • Provider supports G.726 in accordance with RFC 3551 unchecked
  • Provider supports call-back on busy (CCBS) in accordance with RFC 4235 unchecked
  • Provider supports forwarding of calls during the calling phase unchecked
  • Packet size in milliseconds in send direction 20
under Additional Settings for the Connection
  • Use telephone number for registration checked
  • Always register via an internet connection checked
Contact internet telephony provider via
  • Transport protocol only via IPv4
  • Media protocol RTP/AVP
  • Provider supports MWI (RFC 3842) unchecked
  • Provider does not support REGISTER-fetch unchecked

It may also work with some of the above configured differently, but what is shown above works for me.

FRITZ!Box 7490 / FRITZ!OS:7.59 -- all works fine

The Additional Settings for the Connection section seems to have been rearranged slightly, compared with the above.

under Additional Settings for the Connection

I have:

  • Use telephone number for registration checked
  • Always register via an internet connection checked
  • Contact internet telephony provider via only via IPv4
  • Transport protocol Automatic
  • Media protocol RTP/AVP
  • Provider supports MWI (RFC 3842) unchecked
  • Provider does not support REGISTER-fetch unchecked

The interesting difference here is that I have the encrypted telephony option checked, and it still works.

under Telephone Number Format:

I have:

  • Country code select none
  • Area code select none

because my box is globally configured to match its location in Germany, so offers me only With prefix (0049) as an option, which is unhelpful. I tend to dial UK numbers prefixed with 0044, which may be a habit that I developed in order to make sure this setting works for me. -- Philh (talk)

FRITZ!Box 5530 / FRITZ!OS:8.24

Setup very easy, this version of FRITZ!OS has a lot more automatically negotiated functions. IPv6 calls work a dream. FRITZ!OS captures * and # at the front of any of the VoIP - Special Codes. To dial these you need to prefix the shortcode with *#, e.g. *#*107 for your account number Joey (talk) 16:11, 21 April 2026 (UTC)


Fritz!Box
Tested on FireBrick SIP Server Not yet
IPv6 Support Yes
Versions and models Tested 7390

Firewall & Security

  • Newly registered handsets will not be able to make international calls, this can be disabled under Telephony > Phone Numbers > Line Settings > Security
  • You will also want to set up firewall rules, as per the VoIP Firewall page.
  • Also see the VoIP Security page for information about securing your VoIP service.
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