h1. SIP SIMPLE protocol

This protocol is supported along with [[SIP protocol]].
Thus, inside the same SIP connection client could consume services of both [[Telephony]] and [[Messaging]].

Message receive and transmit is possible in following modes:

* *in-call*.
  These messages are routed to subscriber with whom you're currently talking.
  These messages doesn't pass [[Message routing]] system, are not billed according to [[Message billing]] and are not saved in reports.

* *out-of-call*
  These messages pass through the [[Message routing]] system, are billed according to [[Message billing]] and are saved in reports.
  After routing these messages could be routed to [[SMPP protocol|SMPP]] provider, and delivered to cellular subscriber.
  Thus, customer is able both to call and send messages using the same SIP softphone.
  To enable this possibility you should enable an option Security -> *out-of-call messaging* = yes inside SIP parameters of a peer.

[[Протокол SIP SIMPLE|Русский перевод]]