User`s guide

Dialogic
®
Host Media Processing Software Release 4.1LIN Release Guide 29
Features
In addition to IPM to IPM connections, native hairpinning connections may also be formed
between 3G-324M and IPM devices.
Connections between devices are made using the Dialogic
®
Device Management API
library.
Use cases for native RTP hairpinning include switching type applications, such as an IP-
PBX, or streaming data to/from an external speech server. Benefits of using native RTP
hairpinning include increasing achievable system densities, reducing latencies, and
improving voice quality by eliminating an additional decode/encode operation.
3.14 IP Signaling
The Dialogic
®
HMP Software 4.1LIN supports the industry-standard Session Initiation
Protocol (SIP).
New IP signaling features in Dialogic
®
HMP Software 4.1LIN include:
H.323
Note that this release does not directly support video applications using Global Call
H.323, although customers may choose to develop audio/video applications using
their own H.323 stack.
SIP Re-INVITE
Support for subsequent INVITE requests, also known as re-INVITE requests, on
existing SIP dialogs (calls). A Dialogic
®
Global Call application using the SIP protocol
can originate a re-INVITE request to a remote endpoint, receive a re-INVITE request
from the remote endpoint, and accept or reject that received re-INVITE.
3.15 Tone Management
There are no new tone management features in Dialogic
®
Host Media Processing
Software Release 4.1LIN.
Tone management support includes:
• In-Band DTMF detection and generation
• RFC 2833 DTMF detection and generation
• H.245 UserInputIndication message in 3G-324M interface
3.16 Secure Real-Time Transport Protocol (SRTP)
Secure Real-Time Transport Protocol (SRTP) is supported.
Real-time Transport Protocol (RTP) is commonly used for the transmission of real-time
audio or video streams in Internet telephony applications. Secure RTP (SRTP) is an