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Why SCCP and MTP3 both are considered as network layer?

+1 vote
Why SCCP and MTP3 both are considered as network layer?
posted Jan 19, 2015 by anonymous

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2 Answers

0 votes
Best answer

Both SCCP and MTP3 does the routing. MTP does the point code base routing where as SCCP does PC-SSN or GT based routing. So in short both the layers are doing the routing hence both are considered as network layer.

answer Jan 19, 2015 by Salil Agrawal
0 votes

On behalf of Bart -
I find it a very strange question to ask.. No one would ask why IPv6 and IPv6 are both considered a network layer. This is why they were made for.

I believe the question should be what is the difference between SCCP and MTP3. So the SCCP was developed with MTP3, obviously after the MTP was developed. MTP was designed to carry circuit call related signaling, where with the SCCP it is capable to handle the noncircuit as well.

The main difference I would say is that SCCP is doing end to end routing where MTP3 is doing point to point routing. While MTP L3 can only identify and distribute messages to specific points and user parts, SCCP can route messages to specific applications that reside at signaling points.

On top of that SCCP is OSI Layer 3 compliant, in theory it can be transmitted over any OSI-compliant network.

answer Jan 19, 2015 by Salil Agrawal
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+2 votes

I see a high number of SCCP CREFs(Connection Refusal) in the logs. None of the calls are successful as observed from PM Counter statistics. The application has refused with the cause 7.From ITU-T Q.713 it indicates 00000111 network resource QoS unavailable/transient.

SCCP stack has logged unsolicited status indication with the event "Connection request failure" and cause "connection threshold exceeded".

Please let me know,

1.) What does this "connection threshold exceeded" indicate? Is this the SCCP connections ? Is it configurable ?
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Please give me your valuable inputs on how to debug this further. Whether congestion can be the reason?

+1 vote

As per some specification and my knowledge it seems ISUP can be over SCCP or SUA protocol. My questions here are -
1. How practical it is, it it rarely practiced or commonly followed.
2. What is the advantage at the network level if we do so.

+6 votes

Where SS7, H.323 and SIP are used in VOIP network ?

+1 vote

Lets say any messages went in TCAP END for which I need not get any ACK back.
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Is it intentionally node is sending or happening due to some cause ?

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