User manual

Establishing IP connections
70 © MAYAH Communication GmbH
2. Configuration steps at MERK II decoder
2.1 Codec settings
Configure the codec settings via menu item Settings/Codec:
· Interface: IP/RTP
· Encoder dependency: Remote
· Decoder dependency: Remote
2.2. Establish Connection
Click the CONNECT button to open the Connect-dialog:
· Select interface to IP
· Select SDP/Decoder
· Check SAP
· After the SAP box is checked the list box of ‘#1’ is updated with the currently available
SAP streams; one of this SAP streams must be selected
· Click the OK-button to establish connection
7.5.4. SIP Streaming
Since system version 3.2.0.78 SIP is supported and in constant working process.
1. General
The Session Initiation Protocol (SIP) has been developed by the IETF (Internet
Engineering Task Force) and is described in rfc 3261 (www.ietf.org/rfc/rfc3261.txt).
This protocol can be used to establish, modify and terminate multimedia sessions and is
currently used in most Voice over IP (VoIP) and Internet telephony applications.
As a client-server protocol, SIP is similar to HTTP and SMTP (email). Its requests and
responses are text strings containing information about the session that is to be
established. SIP addresses are composed using a syntax similar to email addresses e.g.
sip:[e-mail]
The complete separation of signalling and transport layer (i.e. of connection data and
media data), as implemented in SIP allows for the user to establish a connection in a
unified way without prior knowledge of the exact location of other participants and not
depending on the nature of the transferred data. The SIP protocol can furthermore be used
to let two devices auto-negotiate the parameters (e.g. algorithm, sample rate,...) of the
multimedia session.
The constantly growing acceptance of SIP - due to recent developments in fields like
Internet telephony and UMTS - guarantees for a steady growth and expansion of
infrastructure. Since SIP supports the negotiation of bandwidth reservation and reservation
is needed for good quality Internet telephony, network providers will need to deploy
mechanisms for bandwidth reservation in their networks – a critical need for all
professional Audio-Over-IP applications.
In addition SIP is also part of the “Next Generation Network (NGN)” as defined by the
European Telecommunications Standards Institute (ETSI) and is thought to be a
replacement for ISDN. Since ISDN will eventually disappear in most countries the
designated successor has been appointed: SIP.