• Interconnect: Public Internet / leased line

Protocols for the interaction of telematic services:

  • protocols: SIP, H.323

Technical parameters of the quality of the telematic services complex for 85% of sessions:

  • Maximum connection delay (sec): 3…5 s;
  • The loss factor of IP datagrams is not more than 1х10-3;
  • The error rate of IP datagrams is not more than 1х10-4;
  • Time of transfer of datagram IP no more than 1 s;
  • Maximum transmission delay for IP datagrams – no more than 150 ms;
  • Variations of the IP datagram transfer time (ms): not more than 40 ms;

Voice codecs:

  • G.711 A-law (PCMA)
  • G.711 μ-law (PCMU)
  • G.729

RTP Packet (frame) Size = 20 ms


  • T.38 fax relay
  • G.711 fax pass-through

Format CallerID (A-number) and CalledID (B-number):

  • E.164 (for example Russia, Moscow: 74951234567; China, Pekin: 861012345678) without prefix  «+», «00» and other.
  • technical prefix: depending on requirements


The work behind NAT is not guaranteed, but if you are still behind NAT, we recommend:

  • Work with the registraring on our softswitch (username/password)
  • Use any public STUN server
  • Your private IP should not appear in SIP headers
  • Inform us information about both the private and public IP of your PBX

The work behind double NATs is not recommended and technical support is not provided in this case.

Call Requirements:

  • The maximum increase in calls per second (CPS) – 5
  • Maximum load per channel – 0.2 Erlang per 1 ANI number

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