• 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.