General SIP information

SIP addresses

SendMyCall originates calls to customers from the following endpoints:

46.19.209.14:5060 (for US PoP)

46.19.210.14:5060 (for EU PoP)

These IP addresses correspond to our routing cluster exit nodes.

RTP addresses

Our system sends RTP packets from the following subnets:

46.19.208.0/21

with RTP port-range: 10000-32767

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).

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