VoIP Gateway SS7 H.323 Call Setup Resource Verification

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Solution Overview

Problem

In VoIP systems combining telephony and packet switched data networks, resources are wasted when H.323 call setup occurs before verifying the availability of termination leg resources, leading to increased call setup times due to slower H.323 signaling compared to SS7 signaling.

Innovation Solution

Implementing call setup using SS7 out of band signaling to verify termination leg resource availability before initiating H.323 signaling within the packet switched data network, ensuring that H.323 setup only proceeds if the termination leg can take the call, and utilizing a gateway with both SS7 and H.323 capabilities to manage signaling protocols.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If H.323 signaling is used for call setup in the packet switched data network, then the call can be established over the Internet, but resources are wasted when the termination leg cannot take the call

Engineering Contradiction:

Improvecall setup capabilityVSAvoidresource wastage

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The patent applies preliminary action by using SS7 signaling to check resource availability in the termination leg before initiating H.323 call setup in the packet switched data network. This ensures that H.323 resources are only allocated when the termination leg can actually accept the call, preventing resource wastage.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If H.323 signaling is used for call setup, then the call can be established over the Internet, but the call setup time increases

Engineering Contradiction:

Improvecall setup capabilityVSAvoidcall setup time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent performs resource availability checking using SS7 signaling before initiating the slower H.323 call setup process. This preliminary action prevents unnecessary H.323 signaling transactions, thereby reducing overall call setup time while maintaining Internet call capability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent segments the call setup process into two distinct phases: first, rapid resource availability checking using SS7 signaling, and second, call establishment using H.323 signaling only if resources are available. This segmentation allows the system to leverage the speed of SS7 for resource verification while using H.323 for actual call setup.

Inventive Principle:

Principle #1Segmentation

3Productivity

If H.323 signaling is initiated without verifying termination leg resources, then call setup can proceed, but resources are allocated and then torn down unnecessarily

Engineering Contradiction:

Improvecall setup throughputVSAvoidresource wastage

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent implements preliminary resource verification using SS7 signaling to confirm termination leg availability before initiating H.323 call setup. This prevents the scenario where resources are allocated in the packet switched data network and then torn down due to termination leg unavailability, improving resource utilization efficiency.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8750289B2Call setup using voice over the internet protocol (VoIP)

Publication Date: 2014.06.10 ITXC IP HLDG R L

AI summary

A method of performing call setup in a system comprises an origination telephony network, a termination telephony network and a packet switched data network interconnecting therebetween comprises steps of implementing call setup across the two telephony networks by SS7 protocol and implementing call setup within the packet switched data network by H. 323 protocol. In particular, the call setup in the data network is not started until information of the resources status in the termination telephony network is available. A novel gateway is provided to implement the method, which comprises both SS7 capabilities and H. 323 functionalities.