IP Addresses

Calls originate from the following endpoints:

• (for New York POP)

• (for Frankfurt POP)

• (for Los Angeles POP)

• (for Miami POP)

• (for Singapore POP)

RTP traffic might arrive from following subnet:


• with RTP port-range: 1024-65535


We transmit and receive RTCP packets from port = rtp_port + 1 (as recommended in RFC3550). We're also able to receive RTCP packets on the same RTP port. Consider utilizing RTCP conflict avoidance payloads (payload types 72-76).

Supported codecs

  • G.711 A-law/U-law
  • G.729
  • G.723.1
  • L16
  • G.726-16/G.726-40/G.726-32/G.726-24
  • G.721
  • GSM
  • Speex

DTMF transport methods

DTMF signaling is supported as follows:

By default RFC 2833 is enabled

Sample Asterisk Configuration

Sample IAX Configuration