VoIP Push Gateway -About

Push notification support for any SIP server and client app       

VoIP Push Notification Gateway (MPUSH) is an universal solution to add VoIP push notification capabilities to your existing SIP server and SIP client applications.

The main purpose for push notifications in VoIP is to wake-up sleeping or closed SIP applications when new call or message is received. This will improve availability and reduce battery usage for the applications.
Cloud push messaging are offered for free by major players (Google, Apple) as highly reliable and efficient way to deliver information while the phone is off (sleeping, dozing or app closed).
MPUSH will connect together your SIP server and your SIP client applications with the push notification cloud providers.
MPUSH is compatible with all SIP servers (IP-PBX or Softswitch like Asterisk, 3CX and others) and all SIP applications including Android, iOS and Web apps, be it a softphone or any specific application.

Legacy VoIP applications had to maintain a persistent TCP connection or UDP with frequent keep-alive to receive incoming call and chat messages. The drawback of this was more network/CPU usage consumption and excessive battery utilization on mobile devices.
With VoIP Push notifications support you can modify your SIP application to always receive incoming calls, without the need of a background service and regardless whether the app is sleeping, dozing or closed.
Push notification support is already highly recommended and will become mandatory for mobile operating systems. Latest versions of iOS and Android are becoming more aggressive with closing background applications and disconnecting network connections if the app is not in foreground. 

MPUSH aims at being integrated with SIP infrastructures (your existing softswitch) that do not support push notifications. It is not required to run a separate MPUSH gateway if you are using any Mizutech server side solution since all our software has push notification support built-in (including the VoIP server, the IP-PBX, the SBC and the WebRTC-SIP gateway).

Download SIP push notification gateway

What is VoIP Push Notifications?

Push notification, also called server push notification, is a server to client message delivery mechanism where a message is sent to an Android application, Apple application or Browser based web application. 
VoIP Push notification is an efficient solution to wake up sleeping or closed applications on incoming SIP call or chat message thus offering reliable availability for SIP users in an energy efficient way, without the need to constantly run a background service and to keeping a connection with the IP-PBX.
The SIP application can handle these messages different ways: usually by just waking up on incoming call notification or displaying incoming text messages as system notifications.
The two biggest cloud providers for push notification are Apple (APNS or Apple Push Notification Service) and Google (GCM and Firebase messaging). A web standard already exists by W3C Push API.
Using SIP Push notifications has the following benefits:

  • battery saver: you don't need to run a background service or keep a connection with the SIP server anymore to be able to receive incoming calls
  • availability: push notifications will make your app more reliable to receive incoming call and text messages
  • app store requirements: recent iOS and Android versions have started to force developers toward using push notifications and apps running in background or avoiding sleep might be banned from app stores this push notifications becomes mandatory


How it works?

The MPUSH software have to be run near your SIP server(s) and it can act as a proxy, gateway or SBC between your SIP client apps and your server providing push notification support for your SIP client by transparently forwarding the SIP protocol, optional RTP routing and optionally offering extra services to extend your SIP service capabilities (such as conference and call recording).
Too add VoIP push notification support into your SIP application, you will have to register to your push notification cloud service (Apple or Google) using the API provided by your OS to get a token. Then just add some extra SIP headers to inform the server about your subscription token and handle the incoming notifications initiated MPUSH. The rest is done like before, via the standard SIP protocol with no other modifications required.
When a new call or chat message arrives, then it will send a push notification to the target SIP client before to deliver the SIP signaling, and keeps to resend the SIP signaling message until the client app wakes up (server receives a register) or after the predefined timeout period elapse.



VoIP Push Notifications


Changes required for your software:

  • SIP Server: no any changes will be needed (the MPUSH gateway will act as a transparent proxy)
  • SIP Client: you need to make small modification to your application to enable push notifications as described here (easy to follow document with copy-paste code)


How to use?


  • OS: The MPUSH gateway runs on Windows OS. Any Windows version is fine such as Windows Server 2016, 2019 or 2022 Standard or Windows 7, 10, 11. Can be hosted also in a virtual machine.
  • For 100 simultaneous calls/5000 users: any hardware configuration which can barely run Windows such as a low-end CPU with 2 GB RAM, 40 GB disk space
  • For 2000 simultaneous calls/80000 users: a "best-buy" server with 4-8 CPU core, 8 GB RAM, 80 GB disk space
  • More details can be found here

Follow these steps for setup, configuration and integration:

  1. Download and install the MPUSH gateway near your SIP server (on the same server or on a separate box or virtual machine)
  2. Launch the admin client and go through the configuration wizard setting the appropriate options after your needs (SIP signaling listener IP:port and your SIP server address). 
    The gateway can be managed the same way as the SBC for which you can download the documentation from here
  3. Integrate into your SIP app as described in the documentation

The mpush gateway doesn't require any maintenance or active administration. The gateway will act as a transparent SBC or SIP proxy and once it is configured, you will continue the management of your VoIP network (users/extensions, routing and any others) from your Softswitch or IP-IPB as you did it before.



The VoIP push notification gateway is an easy to use and full featured solution. Above its main role of providing push notification services, it contains also other optional modules which can be used to enhance your VoIP service quality, functionality and availability. The included features are the followings:

  • RFC 8599 (Push Notification with the Session Initiation Protocol) or proprietary signaling (X-MPUSH SIP header)
  • SIP signaling (on UDP, TCP and TLS) and media stack (RTP, RTCP)
  • Push notification on incoming call
  • Push notification for other sessions (such as chat SIP MESSAGE)
  • Push notification management
  • Support for Google FCM, Apple PushKit APNS and generic/web
  • Works like a SIP proxy or as SBC
  • Keeps the SIP endpoints registered when the app is closed or device sleeping
  • Flexible routing 
  • Extended SIP protocol support (call fork, queue and many more)
  • Extra features such as call recording, rerouting, WebRTC and many more
  • Media (RTP) routing or offloading
  • Multiple sip servers
  • Multiple applications
  • Multiple APN's
  • High availability support including failover and load-balancing
  • Security: HTTPS/WSS encryption and TLS/SRTP support for SIP
  • DoS atack protection, session protection, auto-ban and more
  • Auto certificate management via Let's Encrypt
  • Auto add new user records (transparent digest authentication toward your SIP server)
  • Auto remove expired or wrong devices (invalid token or subsequent failure)
  • GUI management and monitoring
  • Configuration wizard
  • Detailed documentation


MPUSH Advantages

  • Never miss any incoming call or chat
  • The easiest way to add robust push notification support for your existing SIP server and SIP clients
  • Fast and reliable voip push notification for any SIP app
  • Compatible and easy integration with all SIP servers (ex. Asterisk) and all SIP client applications running on iOS (iPhone, iPad, others), Android (phones, tablets), Web applications and other platforms
  • Compatible with all popular cloud messaging providers (Google Firebase FCM and Apple APNS)
  • No configuration change required on your server
  • Wakes the device only when necessary, saving users battery, CPU usage and network data consumption
  • Your SIP client will wake up even if it was in sleeping, dozing or closed
  • Easy integration with your application without the need to use any third-party SDK
  • Self hosted solution (not a SaaS/subscription; you completely own and control the software)
  • Since there is no background connection to the SIP provider, the battery will not be drained
  • Developer friendly documentation (with step-by-step instructions and copy-paste code examples)
  • Affordable: simple and transparent pricing
  • Scalable: easy vertical and horizontal scalability to support your growing number of subscribers
  • NAT and firewall traversal: support for encryption, tunneling and obfuscation to bypass any ISP VoIP filtering common in counties like China or UAE
  • Easy administration with no any active maintenance required
  • Monitoring: detailed statistics with powerful metrics (server load, users, CDR's, ASR, ACD, call disconnect reasons and many more)


What's New

The latest stable version (v.2.8.24062) have been released at June 12, 2024 with support for the new FCM HTTP v1 API (upgrade guide), multi-threaded Apple APNS push queue, support for cancel push notification, sendpush API and the latest SIP/media stack merged from the VoIP sever (changes).


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