Posts Tagged ‘sip’

RFC 2782 and SRV Records

September 27th, 2013 No comments

Some protocols such as SIP and XMPP require SRV records. SRV records have the form TTL class SRV priority weight port target

Example DNS entry with A and SRV record: 86400 IN A   86400 IN SRV 0 5 5061  < == (which can be the SIP/SIP-TLS service on Read more…

Categories: DNS and BIND Tags:

SIP – Example Simple Two-Party Call Flow

August 14th, 2012 No comments


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…

Categories: Voice over IP Tags: ,

Asterisk CLI Commands

December 30th, 2010 No comments

Another aide-memoir reproduced from  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…

Categories: Voice over IP Tags: ,

Trunk to Asterisk from Cisco Call Manager Express

May 14th, 2010 No comments

This configuration enables a trunk between an Asterisk Open Source PBX and Cisco Unified Call Manager Express: Read more…

Categories: Voice over IP Tags: ,

SIP – Communicating Between Domains

May 14th, 2010 No comments

Another Aide-Memoir: SIP User Agents in different domains  – session establishment (also uses location server): Read more…

Categories: Voice over IP Tags: ,

Testing VoIP using “Fun Numbers”

May 13th, 2010 No comments

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…

Categories: Voice over IP Tags: , ,