Offer your customers a variety of advanced class 5 features for cloud PBX or hosted PBX services, Session Border Controller (SBC) features with PortaSip

PortaSIP, a softswitch and SBC:

  • Session Border Controller features
  • Class 4 for wholesale VoIP and SIP trunking
  • Class 5 with IVR and media applications for residential and business telephony

PortaSIP is a clusterable and highly scalable SIP softswitch of class 4 and class 5 with media application that plays IVR (voice prompts). It offers a variety of both advanced class 5 features for cloud PBX (also known as IP Centrex) services as well as the majority of functionality normally attributed to session border controllers (SBC), usually called class 4 features, for example:

  • hunt-groups,
  • call forwarding/follow-me,
  • call transfer,
  • group pickup,
  • call parking,
  • NAT traversal,
  • BLF / presence,
  • instant messaging,
  • web and phone voicemail,
  • teleconferencing,
  • IMAP server for email clients,
  • auto attendant,
  • message waiting,
  • abbreviated dialing,
  • call recording, and
  • automated provisioning of IP phones

contactFor more technical and/or pricing information about PortaSIP please contact our sales team.

In this sense, PortaSIP combines two major VoIP network elements in one: it can seamlessly play a double role of a highly sophisticated softswitch for cloud PBX/hosted PBX services and a very robust SBC at the same time. Multiple PortaSIP servers can create geographically distributed clusters for load balancing, redundancy, and linear capacity scalability.


As an integral part of PortaSwitch, it also provides a powerful LCR, preference-based, priority-based, and dynamic (e.g. ASR, PDD) routing engine.

Based on the Session Initiation Protocol, PortaSIP provides a full array of call routing capabilities to maximize performance in both small and large packet voice networks. PortaSIP allows carriers and IP telephony service providers to deliver communication services at incredibly low initial and operating costs, which cannot be matched by yesterday's circuit-switched and narrow-band service provider PSTN networks.

With PortaSIP, services that combine elements from telephony and other web applications such as e-mail, messaging, Internet and video streaming can be created easily and in a shorter planning and implementation cycle, allowing increased market responsiveness.

PortaSIP offers a platform for delivering innovative, high-margin services that may be deployed over IP, as well as cable, POTS, Broadband, and ISDN networks.

PortaSIP supports:

  • Any SIP endpoint (network element which can terminate a SIP session)
  • Universal numbering plan, PBX extensions and other numbering schemes
  • Customer dialing rules and abbreviated dialing
  • Clustering of gateways and other servers

The Customer Dialing Rules & Abbreviated Dialing feature works with both SIP and H.323, with adequate support of either a SIP server or Cisco TCL IVR. A PortaBilling customer can set up Dialing Rules as an international prefix, outside prefix, direct number (e.g. 911) or abbreviated dialing for his accounts. More than one dialing rule may be assigned to each account.

The system allows "clustering" of any media gateways and other servers to "roll over" in case of capacity constraints or failure. This allows several devices to be used in tandem, with one overflowing to the next if the number of calls being handled exceeds the limitations of a current device, or if a device fails. Any IP-to-PSTN SS7 media gateway will work. For example:

We provide our PortaSIP customers with significantly discounted secondary PortaSIP licenses to build robust and reliable networks. There is a number of ways to make use of multiple PortaSIP servers achieving such benefits as fault-tolerance, geographic distribution, and high volumes of proxied traffic.

contactFor more technical and/or pricing information about Secondary PortaSIP licenses please contact our sales team.

Clustering for Redundancy

ClusterSeveral physically independent PortaSIP servers may be used in a single system cluster environment to provide fault-tolerant services. Connected to PortaBilling, the system of multiple PortaSIP servers provides all the required service provisioning information and maintains a global database of SIP phone registrations.

A SIP phone user may connect to any of the available PortaSIP servers. If one server is unavailable due to a hardware failure or network problem, calls will be handled by the other PortaSIP servers.

Network Load Balancing

Service providers with global business exposure may chose to install a clustered system of multiple PortaSIP servers in various separate geographical locations. This allows them to keep the service running even if a whole hosting center in one place is down.



This kind of architecture also improves the network utilization: for instance, users in Asia would primarily use a PortaSIP server hosted in Singapore or Hong Kong, while European customers will work with a PortaSIP server in Frankfurt or London.

RTP Proxying

RTP smallITSPs with a high volume of proxied calls within their network can transfer the RTP proxying function to a dedicated secondary PortaSIP server. This will allow them to efficiently prioritize the transmission of IP packets carrying the voice media and prevent any resource-intensive operations on the SIP side from affecting the voice quality.

Since fast and reliable connectivity between PortaSIP server and RTP proxy is important, both main PortaSIP server and the secondary PortaSIP used as an RTP proxy server should be installed on the same LAN and connected by the FastEthernet link.

Media Server Applications

PortaSIP media server provides IVR playback for various telecommunication services: balance info, prepaid calling card announcement, auto-attendant, fax-to-email, voice mail and teleconferencing.

The PortaSIP media server includes:

  • web mail interface and IMAP server for PC and mobile email clients
  • applications where voice messages are automatically transcribed into the text and delivered to an external email server or user's smart phones
  • message waiting indication for IP phones
  • functionality to create a virtual office environment using auto-attendant, extension transfer and call queues facilities
  • other class 5 features including find me & follow me, message waiting, abbreviated dialing, company directory, moderated and non-moderated teleconferencing in multiple meeting rooms for each account with customized names and sets of parameters, as well as various pricing models (time-based, per usage, mixed, etc.)

Toll-free calls (phone & Skype)
+1 866 747 8647
Calls & faxes from abroad:
+1 604 628 2508

PortaOne, Inc.
A113 – 2099 Lougheed Hwy,
Port Coquitlam, BC, V3B 1A8

Superb reliability and scalability with
24/7 professional technical support

Open architecture

Open architecture

PortaOne provides both APIs and source code for PortaSwitch to allow an easy integration
Scalability for growth

Scalability for growth

Our platforms can easily scale up by adding more servers to match your project success
Reliability and redundancy

Reliability and redundancy

Clustering and geo‑redundancy for high availability configuration and zero downtime updates
Agile development

Agile development

PortaOne delivers more than 20 software builds per year - new features are available every 7 weeks
24/7 technical support

24/7 technical support

Over 60% of our 300 engineers are in the technical support services, praised as the best in industry

Core solutions

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