1. Overview of H.323-SIP Gateway
Agenda
Technology
Issues
Architecture
Message Flow
Implementation
Future
26-Apr-19
Overview of H.323-SIP Gateway

2. Protocols Transport Layer IP and lower layers Terminal Control/Devices
Q.931
H.245
RAS
RTCP
RTCP
Codecs
SIP
SDP
Codecs
RTP
RTP
TPKT
TCP
UDP
Transport Layer
IP and lower layers
26-Apr-19
Overview of H.323-SIP Gateway

3. Overview of H.323-SIP Gateway
Issues
User Registration
Call Sequence
Mapping Session Description
Transparent RTP/RTCP
. . .
26-Apr-19
Overview of H.323-SIP Gateway

4. Architecture Signaling Gateway “Application” API API H.323 Library
(Q.931, RAS,
H.245)
SIP Library
(SIP, SDP)
H.323 Network
SIP Network
26-Apr-19
Overview of H.323-SIP Gateway

5. Overview of H.323-SIP Gateway
Message Flow
SIP Network
H323 Network
Setup/Q931
INVITE
Gateway
Connect/Q931
Capabilities/H245
Capabilities/H245.
200 OK.
Open Logical Channel/ H245
Open Logical Channel / H245
ACK
RTP/RTCP
RTP/RTCP
26-Apr-19
Overview of H.323-SIP Gateway

6. Overview of H.323-SIP Gateway
Message Flow
H323 Network
SIP Network
Setup/Q931
INVITE
Connect/Q931
200 OK
Gateway
Capability Exchange
ACK
Open Logical Channel
Re-INVITE/SIP+SDP
Open Logical Channel
RTP/RTCP
RTP/RTCP
26-Apr-19
Overview of H.323-SIP Gateway

7. Implementation Issues
SDP/H.245 mapping. How to calculate subset of capabilities ?
Where to send RTP/RTCP in case of non-FastStart ?
How to convert OpenLogicalChannel to SDP ?
26-Apr-19
Overview of H.323-SIP Gateway

8. Overview of H.323-SIP Gateway
Implementation
Two way call. Either side can initiate the call
Fast Connect as well as non-Fast connect
RTP packets directly between the endpoints
Codecs supported - on going
Multiple calls simultaneously - on going
User Registration - on going
Call transfer and Multiparty conference - NO
26-Apr-19
Overview of H.323-SIP Gateway

9. Overview of H.323-SIP Gateway
Future
SIP/IP
H323/IP
Gateway
Voice Mail
PSTN
26-Apr-19
Overview of H.323-SIP Gateway