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An ALG is very similar to a proxy server, as it sits between the client and real server, facilitating the exchange. There seems to be an industry convention that an ALG does its job without the application being configured to use it, by intercepting the messages. A proxy, on the other hand, usually needs to be configured in the client application.
[1]: §21 SIP responses also specify a "reason phrase", and a default reason phrase is defined with each response code. [1]: §7.2 These reason phrases can be varied, however, such as to provide additional information [1]: §21.4.18 or to provide the text in a different language. [1]: §20.3
Intertex SIP transparent routers, firewalls and ADSL modems, for broadband deployments and SOHO market; Juniper Networks Netscreen and SRX firewalls include complete SIP Application Layer Gateway support; Linux Netfilter's SIP conntrack helper fully understands SIP and can classify (for QOS) and NAT all related traffic; Netopia Netopia supports ALG
The user agent client (UAC) sends SIP requests. The user agent server (UAS) receives requests and returns a SIP response. Unlike other network protocols that fix the roles of client and server, e.g., in HTTP, in which a web browser only acts as a client, and never as a server, SIP requires both peers to implement both roles.
These two extensions allow users to specify their preferences about the service the IMS provides. With the caller preferences extension, [8] the calling party is able to indicate the kind of user agent they want to reach (e.g. whether it is fixed or mobile, a voicemail or a human, personal or for business, which services it is capable to provide, or which methods it supports) and how to search ...
A SIP address is written in user@domain.tld format in a similar fashion to an email address.An address like: sip:1-999-123-4567@voip-provider.example.net. instructs a SIP client to use the NAPTR and SRV schemes to look up the SIP server associated with the DNS name voip-provider.example.net and connect to that server.
Examples of CPE types include modems, routers, gateways, set-top boxes, and VoIP-phones. TR-069 was first published in May 2004, with amendments in 2006, 2007, 2010, July 2011 (version 1.3), [ 1 ] and November 2013 (version 1.4 am5) [ 2 ] The Home Gateway Initiative (HGI), Digital Video Broadcasting Project (DVB) and WiMAX Forum have endorsed CWMP.
Network address translation typically uses private IP addresses on private networks with a single public IP address for the router facing the Internet.The network address translator changes the source address in network protocols for outgoing requests from that of an internal device to its external address, so that internal devices can communicate with hosts on the external network, while ...