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• Available Bandwidth – For calls with pass-through media, the SBC computes the media bandwidth required for each call leg, and determines if there is sufficient bandwidth available to host the call. Calls exceeding the bandwidth limit of the interface are rejected.
• Call Rate – If the incoming call rate exceeds the rated capacity of the platform, calls are discarded to protect the system from overload. The number of concurrent sessions required is directly related to the Call Rate and the Call Hold Time (CHT). High call rates with a low average CHT value will result in fewer sessions than the same call rate with a high average CHT value.
• System Limits – Each platform includes upper limits on the number of sessions supported. For example, the SBC 5200 supports a maximum of 64,000 sessions, while the SBC 5100 supports a maximum of 10,000 sessions.
• License Limits – The SBC is licensed for the maximum number of sessions desired. However, the license limit may be less than what the Bandwidth, Call Rate or System limits support. Any call that exceeds the licensed limit of the SBC platform are rejected.

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Example #1: Call with one Session

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The SBC is a controller, which means it controls not only whether traffic can enter the network, but where it should be sent (referred to as session routing) and what type of modifications should be made to the traffic (example, transforming a SIP message header into an H.323 message header or downgrading an HD voice call to a compatible voice codec).

 Sonus Sonus SBC Portfolio Components

The Sonus

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• SBC

  Spacevars
  0 model1

  /

  Spacevars
  0 model2

   Platforms
  Targets medium to large session count deployments (500 to 64,000). These capacities make this product particularly well suited for large enterprises and medium to large service providers.
  
  
• SBC 7000 Series
  Targets large session count deployments (up to 150,000 sessions). The product capacity is well suited for large service providers. Example deployment scenarios include:
  
  • Service Provider Access – High subscriber and simultaneous call scale coupled with high availability and redundancy.
  • Service Provider Peering – High simultaneous call scale coupled with high availability and redundancy.
  • Enterprise and Service Provider Video – Supports large WAN interface bandwidth.
  • Wireless – Supports a large number of subscribers and calls where high availability is essential.
    
    
• SBC Software Edition (SBC SWe)
  Targets small to large session count deployments (25 to unlimited). These capacities make this product particularly well suited for small to large enterprises and service providers. SBC SWe application resides on a private or public virtualized cloud,or on a dedicated server.

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= supported	Medium Enterprises / Small to Medium Service Providers		Large Enterprises / Medium to Large Service Providers
Platform	51x0	SBC SWe	52x0	Spacevars 0 series2
Maximum number of non-transcoded sessions	10,000	See SBC SWe Performance Metrics	64,000	150,000
Call handling capacity	250 - 10,000 sessions	25-unlimited	500 - 64,000 sessions	up to 150,000 sessions
Full SBC Feature Set
User Interface	Embedded EMA or external EMS	Embedded EMA or external EMS	Embedded EMA or external EMS	Embedded EMA or external EMS
DSP Expansion Module Types	5100: SPS100 / SPS100DB (FRU) 5110: DSP20 / DSP25 (CRU)	N/A	5200: SPS100 / SPS100DB (FRU) 5210: DSP20 / DSP25 (CRU)	DSP-LC (CRU)

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