Configuración SIP diferencia entre peer, user y friend

Algo muy básico pero que muchos Ignoran su gran importancia en comprender la diferencia de cada uno de estas opciones.

type = Description

peer Match incoming requests to a configuration entry using the source                  IP address and port number.

user     Match incoming requests to a configuration entry using the username in the From header of the SIP request. This name is matched to a section in sip.conf with the same name in square brackets.


friend This enables matching rules for both peer and user. This is the setting most commonly used for SIP phones.


http://ofps.oreilly.com/titles/9780596517342/asterisk-DeviceConfig.html