VoIP Peering

Today, calls that originate in one Voice over Internet Protocol (VoIP) network and terminate in another are seldom routed over a purely IP network. In most cases calls are routed through a media gateway to the Public Switched Telephone Network (PSTN) and then through another media gateway to the terminating VoIP network.

However, it is obviously much more efficient and logical to connect the VoIP networks directly using VoIP interconnect or VoIP peering. This allows the call to be transported completely using IP.

The main advantages of peering directly with other VoIP service providers are:

  • Reduction in costs by avoiding PSTN operator transit fees.
  • Improved call quality by avoiding transcoding between VoIP and TDM technology.
  • Reduction in requirement for media gateway capacity.

Albatross facilitates peering between VoIP Service Providers and the potential cost benefits are huge. Every single VoIP call that does not have to pass Push To Talk (PTT) or any other PSTN network means revenue gained.


Routing is one of the main technical issues in connecting VoIP networks. The softswitch or server needs to know which operator (or even SIP/IP address) the call should be routed to.

In a single SIP request, our applications provide all the necessary routing information (in the correct format) for the appropriate carrier, service provider, media gateway, softswitch etc.


Albatross iNode can be configured as a Redirect Server or Proxy Server (See diagram above).

Required for VoIP Peering provided by Albatross:

  • Routing based on E.164/NP/ENUM
  • SIP interoperability
  • CDR generation

Albatross make use of all relevant sources to determine which routing information to send:

  • ENUM directory
  • Number Portability reference database
  • National Number Plan (E.164) directory
  • Internal database: service provider specific

A single or several directories can be queried for each call.


Routing is not the only SIP related issue that Albatross can help address when peering between VoIP networks. If there is a requirement for the customer to adapt to a SIP implementation from another vendor, we can provide our SIP Mediation service.


Albatross supports input, translation and output of any number format.

Standard number formats:

  • E.164
  • ENUM
  • SIP Addresses

Market specific formats, such as:

  • Operator/service provider ID
  • Carrier prefix
  • Location area codes

In addition adaptations can be made to support any customer or country specific formats.