Some protocols such as SIP and XMPP require SRV records. SRV records have the form
_service._proto.name TTL class SRV priority weight port target
Example DNS entry with A and SRV record:
host.yourdomain.com 86400 IN A 195.88.229.113
_sipfederationtls._tcp.yourdomain.com 86400 IN SRV 0 5 5061 sip.yourdomain.com. < == (which can be the SIP/SIP-TLS service on host.yourdomain.com) Read more…
SIP / RTCP
Download this capture file: ” SIP – RTCP control through NAT Device ”
OR: view it now via Cloudshark
SIP is defined by RFC 2543 and is used for multimedia call session setup and control over IP networks. Read more…
Another aide-memoir reproduced from voip-info.org: Asterisk provides Voicemail services with Directory, Call Conferencing, Interactive Voice Response, Call Queuing. It has support for three-way calling, caller ID services, ADSI, IAX, SIP, H.323 (as both client and gateway), MGCP (call manager only) and SCCP/Skinny. SEE ALSO: The Asterisk Book
Read more…
Another Aide-Memoir: SIP User Agents in different domains – session establishment (also uses location server): Read more…
Fun numbers are free (no cost) numbers you can call to either test your connection or get several services. The connections to these numbers are usually free of charge, as the “lines” are using the internet to transfer your voice between you and the service. Read more…