Versatile SIP Technology

The Shout SIP-Switch has been designed from the ground up by Shout Telecoms engineers using standard server technology and robust design. The SIP switch is a highly flexible, secure and fully featured platform with multiple service creation options.

The Shout SIP-Switch terminates SIP trunking and can provide call-routing decisions under the control of the on-board Application Server, or for larger deployments we have an API for external control.

The SIP-Switch can also provide audio playback and DTMF detection capability on-switch, thus reducing the need for external IVR support for audio announcements and menu selections.

Supported RFC's
  • RFC 3261/RFC 2543 SIP: Session Initiation Protocol
  • RFC 2833 RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals
  • RFC 3326 The Reason Header Field for the Session Initiation Protocol (SIP)
  • RFC 3581 An Extension to the Session Initiation Protocol (SIP) for Symmetric Response Routing
  • RFC 4028 Session Timers in the Session Initiation Protocol
  • RFC 3398 Integrated Services Digital Network (ISDN) User Part (ISUP to Session Initiation Protocol (SIP) Mapping
  • RFC 5589 Session Initiation Protocol (SIP) Call Control - Transfer
  • RFC 2976 The SIP INFO Method
Network Address Translation (NAT)

Support of near-end and far-end NAT to allow NAT traversal of signalling and media. Near-end NAT allows the SIP Technology Platform to be located behind a router or border function whilst far-end NAT allows detection of SIP Trunks and User Agents behind a router. This combination of near-end and far-end NAT allows for flexible deployment options.

Call Routing

Call routing is under Application Server control allowing fully programmable routing and dial plans. Our Application Server supports real-time database lookups and web service APIs for powerful custom developed applications with 3rd party integration. Support for SIP Redirection for efficient resource usage with number translation applications under Application Server control.

3rd Party Call Control and Multiple Leg Support

Support for multiple legs and switching of media streams between legs under Application Server control allowing multiple leg applications such as call agent applications, mid-call divert, network IVR announcements and Legal Intercept.

Back-to-Back User Agent (B2BUA) Architecture

The SIP Technology Platform B2BUA Architecture allows the SIP Technology Platform to terminate a SIP Trunk and create new outbound call legs with modified SIP headers. This differs from SIP Proxy behaviour which only allows SIP messages to be re-routed at an IP level. B2BUA architecture allows complete control of the outbound SIP Headers allowing for Session Border Controller functionality, NAT Traversal and privacy/security.

Audio Routing and Media Server Functionality
RTP/Media Stream options
Per SIP Trunk options for signalling only (RTP direct from trunk-to-trunk for efficiency), RTP pass through SIP Technology Platform (for NAT traversal) or an RTP end-point on SIP Technology Platform (for audio play or DTMF detection on SIP Technology Platform).
Audio Play
Audio play on all legs; supports A-party audio for IVR/Media Server functionality or network whisper messages to A and B parties. Instant audio deployment for flexible service creation.
DTMF Detection
Support for SIP INFO and RFC2833 DTMF detection. DTMF can be detected whilst playing audio prompts or enabled mid call to detect DTMF events to signal to the Application Server.
Audio Record
Record audio on any call leg, then FTP or Email the recording to an external destination.
Secure Real-Time Transport Protocol
Secure-RTP supported
Conversation Record
Record a 2-Party conversation as a stereo file with options to encrypt recordings.Call Detail Records
Session Management User Interface
  • Web based user interface administration
  • Monitor calls in progress, call details and force clear-downs
  • SIP messaging and call state trace debug with filters
  • Call statistics SIP Trunk and Trunk Group administration
  • Session Management information available

Black/White list of SIP Trunk IP addresses and a range of PBX Features

SIP Trunk Groups/Routes
  • Independent Inbound and Outbound SIP Trunks
  • Application/Service selection from SIP Trunk Group
  • Call count optionally limited per SIP Trunk Group to manage inbound and outbound SIP Trunk allowances
  • Fail-over and load balance across SIP Trunks in Trunk Group
Call Detail Records

Detailed call data stored on-disc for FTP retrieval

Performance and Licence Model

Performance – High performance thread pool architecture. Calls/Second and BHCA is application and hardware specific, typical calls/second for switched calls are 50 calls/second under Application Server control, per unit.

Licences – The SIP Technology Platform is licensed based on inbound calls and switched call legs. Additional licences are available for audio play and DTMF detection. The SIP Technology Platform can be licensed for up to 960 switched call per unit. Multiple units can be clustered and remotely sited with purchased licences automatically pooled across the entire estate.

  • Fully Programmable
  • Comprehensive API’s for web portal integration
  • Simple Service Creation scripting Language (training provided)
  • Web Management Portals are also available
  • Shout service creation. We frequently develop, integrate and support new voice applications for our customers
Class 4 SIP Switch
  • For core network point to point trunking
  • Carrier-grade: approved for BT IP Exchange, Cable and Wireless, plus proven connectivity to many other SIP interconnects.
Class 4/5 Hybrid Switch
  • For core network trunking with intelligent voice and call control applications
Redirect Server
  • Managing SIP traffic behind an SBC, adding intelligent call control to a network and optimising network utilisation
Media Server

Delivering a comprehensive range of voice applications, including:

  • DTMF detection
  • Audio play
  • Audio record
  • Audio play speed/skip via DTMF
  • Voice Activity Detection
  • Text To Speech
  • Speech Recognition
  • Call queuing
  • Voice menus
  • Email and FTP support for end-to-end applications
Voice Recording Server
  • In-Line (tromboned)
  • RTP sniffer or port mirrored
  • Supports Wav and MP3
Registration Server
  • Connect securely direct to IP phones
  • Authentication
  • Call Transfers
  • SRTP & TLS support
  • Multiple and distributed architecture for high call volumes and resilience
  • Automatic failover and replication ensure high availability
  • Master/slave, load-share and N+1 redundancy configurations
  • Every first purchase comes with a free secondary switch application for redundancy
  • Licences pooled across the entire estate ensuring capacity is never lost
  • Web management interface
  • Graceful shutdown for managed upgrades and system maintenance
  • Automatic system restart in the event of application failure
  • Suite of application management and monitoring tools

Backed by our 24/7 Global support.