Your office extension, on iOS. Ringing even when the app is closed.

Most SIP softphones stop receiving calls once iOS moves them to the background. Dialler doesn't. A server on your network wakes the app through Apple's Local Push Connectivity whenever a call comes in.

For Asterisk, Cisco CUCM and other SIP PBXs.

Features

At a glance

Incoming calls	Open, in the background, or closed
PBX	Asterisk, Cisco CUCM or another SIP PBX, as a SIP trunk or one registered line per phone
Wake-ups	Apple Local Push Connectivity, on the Wi-Fi networks assigned to each phone
Encryption	TLS signalling, SRTP audio
Codecs	G.722, G.711
Directory	One per phone, set in the console or by CSV, editable on the phone
Call controls	Hold, transfer, mute, speaker, keypad, recents
Requirements	iOS 17 or later, a SIP PBX, and a Dialler server reachable from the phones' Wi-Fi on the listed ports

How it works

The PBX calls the server. The server wakes the phone.

The Dialler server sits between your PBX and the phones. It sends the wake-up when a call comes in, and provides the web console for enrolment, directories and status.

PBX

SIP

Dialler server

Wi-Fi

iOS app

The PBX sends the call to the Dialler server.
The server wakes the phone through Local Push Connectivity, and iOS shows the incoming call.
When answered, the app connects and the server bridges the call to the PBX.

Phones receive calls only on the Wi-Fi networks assigned to them.

Set-up

Two binaries, one machine

dialler-server handles calls and wake-ups. dialler-admin is the web console. Both are single binaries, usually run on the same machine.

`7443` TCP	Wake-ups and signalling
`5061` TCP	SIP over TLS
`8080` TCP	Enrolment and directory
`20000–20100` UDP	Call audio

dialler-server \
  -trunk "sip:pbx.office:5060;transport=tcp" \
  -public-host 10.0.0.10 \
  -local-domain office \
  -tls-cert server.pem \
  -tls-key server.key \
  -admin-token-file admin-token

dialler-admin \
  -server-ca server.pem \
  -admin-token-file admin-token \
  -password-file password

For one registered line per phone instead of a trunk, add -pbx-mode lines.

Management

One console for every phone

Add a phone	Enter an extension and a label; the console shows a QR code
Enrol	Scan the QR code with the camera, or type the code in the app. Codes are single-use and expire after 15 minutes
Configure	Wi-Fi networks and directory, per phone
Replace or revoke	Revoke a phone, or issue a new code for a replacement
Status	Phones online, PBX line registration, calls in progress

Contact

Get in touch

Sales	[email protected]
Support	[email protected]