General SIP information¶
SIP addresses¶
DIDWW originates calls to customers from the following endpoints:
46.19.209.14 - New York PoP
46.19.210.14 - Frankfurt PoP
46.19.212.14 - Los Angeles PoP
46.19.213.14 - Miami PoP
46.19.214.14 - Singapore PoP
These IP addresses correspond to our routing cluster exit nodes. For UDP transport we send signaling from port 5060. For TCP we use port range from 5070 to 5200
RTP addresses¶
Our system sends RTP packets from the following subnets:
46.19.208.0/21
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).
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:
Telephone-event RFC2833
SIP INFO draft-kaplan-dispatch-info-dtmf-package-00
application/dtmf-relay
application/dtmf
By default RFC 2833 enabled