The document gives you idea how to build Call Signature service, which launch in Viettel, Vietnam as brand iSign. It is usefull for System engineering or Solution architecture lead.

1. Call Signature (iSign)
Technical proposal

2. Last update
• Sep 2013: Netmon upgraded to support IP wrapped in VLAN
802.1Q tunnel.
• Oct 2013: Netmon upgraded to support Sccp form and BSSAP
messages.

3. What is Call Signature ( Viettel iSign)
• Mobile user, specially
business man will not
answer a call if the calling
number is unknown
• Call may be rejected cause
it is not yet in contact list.
• If the call is reject, then it
will not generate revenue.

4. Call Signature (cont)
• Call Signature provides
information to the called
party about caller’s
information, then it
increases chance the called
will answer the call.
• The Signature displayed
while the phone is ringing.
• The caller need not to send
SMS to explain who he is
after the call was rejected.
Hello darling, this is Hung
and here is my new number
Dismiss

5. It make a call more attractive
• For outbound roamer:
Please call me back,
I’m on travel and have
low balance
• Or a predefine
Signature for each
called person.
Dismiss
Please call me back, I’m
on travel and having low
balance

6. 2 models to know calls
To know the call is
in progress,
monitoring call is
executed based
on using Netmon
functionality.

7. Monitor models
• All monitoring will be non-intrusive, the
signaling traffic will not be affected.
• Connection between MSC and BSC may be
monitored to provide service to all subscriber
• Monitoring connection between MSC and OCS
may be applied if the service is only targeted
to Prepaid subscriber.

8. The call monitor workflows
Dismiss
Please call me back, I’m
on travel and having low
balance

9. THIS PAGE IS INTENTIONALY LEFT BLANK

10. Call Monitoring
• Can monitor both legacy SS7 and SS7 over IP
(Sigtran)
• The SS7analyzer engine inside CallMonitor, we
call it Netmon.
• You will need CallMonitor to develop Call
Signature (or MCA, Welcome )

11. Netmon
• The Network Monitor module, used to decode
SS7 message collected from live tapping or SPAN
port.
• It is very fast, since it was developed in C++
language, for Unix based system and almost
activities are C pointer movement based. No
copying philosophy is applied.
• It support traffic based on M2UA, M3UA.
• Supported Stack: sccp, tcap, gsmmap and Camel

12. Netmon (cont)
• Only Data is filtered, other signaling message will
be drop to increase performance. I.e on M3ua
layer, only Data with SCCP payload is retrieved, in
Sccp layer, only UDT (and xUDT) will be retrieved.
• Sccp Reassemble is supported
• Multiple Tcap Component portions is supported.
• Performance: about 8000 Ip frames/second on a
MacbookPro 2.4Ghz Duo core, 4GbRam, Debian
linux 5.x

13. Netmon Decoding status
Multiple chunks supported
IP over VLAN is also
supported
Ethernet frame
IP
SCTP
M2UA/M3UA
SCCP
TCAP
CAMELMAP
Reassembly supported,
Data Only
Multiple components
supported
Call related message
supported
Location update
messages will soon
supported
Data Only
Sigtran stack
VLAN 802.1Q (
IP
BSSAP

14. Netmon (cont)
• Compliant with: itut-Sccp (Q773, Q775), Itut-
Tcap (Q.713), GsmMap (gsm 09.02) and Camel
(ts 29.078)
• At present, only Call related messages are
supported, i.e: Initital DP, requestBCSMReport,
eventBCSMReport, ApplyCharging, applyChargingReport,
• GPRS related message will soon be supported
in 2013

15. To use Netmon
• Dedicate a file captured with Sigtran data in
pcap format.
• We will check for compatibility, customize
Netmon if necessary, the give you binary
Netmon.
• Decoding result will be written to a text file in
nice format. Your system can read the text file
for further processing.
• Information include: Sccp, Tcap, Cap data

16. Integration with Netmon
• NetMon send decode message to an
Application Server.
• The AppServer will callback to user application
for service processing.

17. To own Netmon
• Get full source with cmake ready.
• Customize netmon to redirect decoding result
to a core logic via networking for processing.
• Just email hungdm9999@gmail.com to
discuss.
(You can visit scansource to see Dialogic price for
Sigtran Monitor, only support to sccp layer)

18. Thank you