1. Architecture rtspd SIP/RTSP Unified messaging RTSP media server sipum
Quicktime
RTSP clients
RTSP
T1/E1
RTP/SIP
Telephone
SIP/PSTN Gateway
switch
SIP
conference
server
sipconf
Web based
configuration
Web server
SIP proxy,
redirect
server
SQL
database
sipd
e*phone
sipc
Software SIP
user agents
Hardware
Internet (SIP)
phones
SIPH.323
convertor
NetMeeting
siph323
H.323
SNMP
(Network
Management)

2. Demo Scenario Web interface SIP-phone to SIP-phone
SIP-phone to PSTN phone
PSTN phone to SIP phone
Device control using SIP
Voice mail service (unified messaging)
Multi-party conferencing
Network management (SNMP)
SIP-H.323 translation

3. Example Call
Bob signs up for the service from the web as
sipd canonicalizes the destination to
He registers from multiple phones
sipd rings both e*phone and sipc
Alice tries to reach Bob
INVITE
Bob accepts the call from sipc and starts talking
Web based
configuration
Web server
Call Bob
SIP proxy,
redirect
server
SQL
database
sipd
e*phone
sipc
Software SIP
user agents
Hardware
Internet (SIP)
phones
cs.columbia.edu

4. PSTN to IP Call 1 2 3 5 4 DID - direct and simple
PBX
PSTN
External T1/CAS
Regular phone
(internal)
Call 1
Gateway
Internal T1/CAS
(Ext: )
Call 7134 2
SIP server
sipd
Ethernet 3
sipc 5
Bob’s phone
SQL
database 4
7134 => bob
DID - direct and simple
No-DID - dial extension, supports more users

5. IP to PSTN Call 4 5 3 1 2 PBX Internal T1/CAS Call 85551212
Regular phone
(internal, 7054)
PSTN
External T1/CAS
Call 5
Gateway
( ) 3
Ethernet
SIP server
sipd
sipc 1
Bob calls
SQL
database 2
Use