General SIP information

SIP addresses

DIDWW originates calls to customers from the following SIP endpoints:

Location

IPv4 address

IPv6 address

New York

46.19.209.14

2a01:ad00:1:14::14

Frankfurt

46.19.210.14

2a01:ad00:2:14::14

Los Angeles

46.19.212.14

2a01:ad00:4:14::14

Miami

46.19.213.14

2a01:ad00:5:14::14

Singapore

46.19.214.14

2a01:ad00:6:14::14

Hong Kong

46.19.215.14

2a01:ad00:7:14::14

Amsterdam

185.238.173.14

2a01:ad00:8:14::14

These IP addresses correspond to our routing cluster exit nodes. For UDP transport we send signaling from port 5060. For TCP and TLS we originate connections from port range 5070-65535

RTP addresses

Our system sends RTP packets from the following subnets:

  • 46.19.208.0/21

  • 185.238.172.0/22

  • 2a01:ad00:1:2::/64

  • 2a01:ad00:1:14:1::/64

  • 2a01:ad00:2:1::/64

  • 2a01:ad00:2:14:1::/64

  • 2a01:ad00:4::/64

  • 2a01:ad00:4:14:1::/64

  • 2a01:ad00:5::/64

  • 2a01:ad00:5:14:1::/64

  • 2a01:ad00:6::/64

  • 2a01:ad00:6:14:1::/64

  • 2a01:ad00:7:1::/64

  • 2a01:ad00:7:14:1::/64

  • 2a01:ad00:8:1::/64

  • 2a01:ad00:8:14:1::/64

with RTP port-range: 1024-65535

RTCP

We transmit and receive RTCP packets from port = rtp_port + 1 (as recommended in RFC3550). Additionally, we are able to receive RTCP packets on the same port as RTP, considering utilizing RTCP conflicts avoidance payloads (payload types 72-76).

SIP OPTIONS

DIDWW is responding on SIP OPTIONS while sending requests to signaling IPs. It will respond on UDP 5060, TCP 5060 and TLS 5061 ports.

Please note that SIP OPTIONS responses are not related to call processing.

Encryption

Our systems supports TLS as a secure transport for SIP signaling and SRTP as a media encryption mechanism. All three SRTP key negotiation mechanisms are supported - SDES, DTLS and ZRTP.

Warning

The SRTP media encryption and TLS SIP transport are disabled by default. Please contact our sales team sales@didww.com to allow traffic encryption for your account.

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 enabled