How to develop MCA Service

What is MCA

• Missed Call Alert system• Notify subscriber who has just return to network

about missed calls while he was unavailable• It is can also be useful to notify the caller that

called party is now reachable. We call it NotifyMe.

• MCA is one of killing Value added Services, beside RingBackTone, SMS, which generate most VAS revenue for Mobile network.

2 ways to develop MCA service

• (1)Call Forwarding based (CFb). The system will receive call forwarding on B party unavailable, record the missed calls then Release it.

• (2) Camel Monitor based (CMb). The system will do non-intrusive monitoring the signaling between gsmSSF and gsmSCF to detect missed call

Camel Monitor based solution

• It is best for network with almost Prepaid subscriber or the gsmSCF can also handle call procedure for Postpaid.

• Like the CFb, it is still required modules for detecting B party to be online, sending SMS.

• The most advantage of CMb is it does not require new SS7Node to be installed, CMb is fast to detect Missed call and also can monitor all normal calls.

The CMb Model

• Call Monitor is in charge of collecting missed call• In Camel, TD50 and 51 used for Missed Call (this

may be variant in mobile networks)

gsmSSF gsmSCFgsmSCFSigtran

CallMonitorCallMonitor

Span ports or live tapping

Missed Call

RecordCore

ProcessingCore

Processingnetwork

Missed Call:

84983000005

DetectOnlineDetectOnline

Call Monitor

• 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 MCA, and Netmon for CallMonitor

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

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

Netmon Decoding status

IP

SCTPSCTP

M2UA/M3UAM2UA/M3UA

SCCPSCCP

TCAPTCAP

CAMELCAMELMAPMAP

Multiple chunks supported

Reassembly supported, Data Only

Multiple components supported

Call related message supported

Location update messages will soon supported

Data Only

Sigtran stack

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

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

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.

Thank you