In general the Performance of LAN against Different Load Conditions Using OPNET IP telephony need more attention towards the CBR traffic and due to the CBR traffic the packet delay variation is increases a lot and thus the overall quality of service offerings is reduced a lot when compared to the other voice applications. The packet delay variation occurred with the GSM quality speech is very less and is almost zero and this indicates the packets are transferred with an optimal rate without any delay across the network and thus the quality of service is increased a lot in this context.

The packet delay variation occurred with the low quality speech is also less when compared to the IP telephony and this indicates that the overall noise across the speech is suppressed at this level and thus the packets are delivered at an optimal rate and thus the overall analysis it is clear that the quality of service can be increased with a low packet delay variation and again this can be achieved with the GSM quality voice application to improve the quality of service. . It can be understood that the packet end to end delay is very less with the GSM quality speech and it is almost zero where the packet end to end delay is more with the low quality speech when compared with GSM and very less when compared with IP telephony.

In general when there is low packet end to end delay then the optimal performance of the network against the quality of service requirements for a voice application can be ensured and the same is proved in this comparison. When all these three scenarios are compared now the quality of service requirements with the GSM speech is at the optimal level and thus always the GSM attributes are perfect at the quality of service requirements. The average traffic received at the voice destination is shown in the above graph. It is clear that the overall traffic received at the voice destination is more with the GSM quality speech when compared to the other two scenarios.

A low traffic is received with the IP telephony and this indicates that ample number of CBR traffic packets are not received at the destination side and thus the quality of service is depressed a lot with the IP telephony application and when the case with the low quality speech is considered an optimal traffic received and even this value is less than the GSM quality speech. From this overall analysis it can be concluded that the quality of service requirements can be enhanced with the traffic received and thus in this case it is understood that GSM quality voice applications are best suited to deliver more traffic and also ensure the maximum quality across the network. 

From the comparison of the three scenarios it is clear that the overall traffic received in packets per second is more with the GSM speech and also the value is constant when compared to all the other two scenarios.  When the traffic received is more it indicates the overall performance of the network is increased in terms of quality delivery and thus from this comparison process it is clear even the traffic received is more with the low quality speech and this indicates that at the idle conditions the low quality speech is increased in terms of the traffic received and thus the overall quality of service is increased due to the traffic received.

A Frequency Based Approach To Intrusion Detection:

Even from this simulation process this indicates that the GSM quality speech is required to ensure the best quality of service requirements. From the analysis if the average traffic sent it is clear that the overall traffic sent is more with the IP telephony and this is due to the reason that the telephony applications impose more traffic by the nodes and with this much traffic the overall traffic sent is increased and the nodes loose the core compatibility of against the quality of service requirements.

A low traffic is sent with the GSM quality speech and this indicates that the quality of service requirements across the voice application can be increased due to the GSM quality speech. The traffic sent by the low quality speech is also more when compared to GSM and thus even a constant traffic sent and thus the overall quality of service requirements is perfect for the GSM quality speech even in this case. When the traffic sent in packets per second is compared a more traffic is sent is with the IP telephony and thus the overall quality of service is reduced a lot and also the value has started after 3 minutes of simulation time.

When the case with the GSM is considered the overall traffic sent is very low and this indicates that the quality of service requirements are enhanced with the GSM speech and even in this case the GSM is proved to be the best quality of service requirements imposed for the voice applications. When the delay incurred across the network is compared with the three scenarios is compared the overall delay is very less with the GSM speech and this indicates that the voice transmission is very fast at the GSM level and the highest value is more with the IP telephony and an optimal delay is incurred with the low quality speech.