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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/1458

Title: THE IMPACT OF EMPLOYING SECURITY MECHANISM ON VOIP NETWORK PERFORMANCE
Authors: Abe b e Demi s s i e
Advisors: Dr . Mo hamme d Ab do
Copyright: 2008
Date Added: 16-Oct-2008
Publisher: Addis Ababa University
Abstract: ABSTRACT Pe r c e i ve d co n ve r s a t i o na l spe e c h q ua l i t y i s a n imp o r t a n t me t r i c s i n Vo i c e o ve r IP (Vo IP) a p p l i c a t i o n s . As IP ne two rk s a r e not d e s i gne d f o r r e a l - t ime ap pl i c a t io ns , t he n e twor k imp a i rmen t s s uch a s pa cke t l os s , j i t t e r a nd de l a y ha ve a s e ve r e impa c t on s pe e c h q ua l i t y. Si nc e Se c u r i t y ha s be c ome a ma j o r c o nc e r n wi t h t h e r a p i d gr owt h of i nt e r e s t i n t he I n t e rne t , th e t he s i s de a l s wi t h t he s e c ur i t y a spe c t s of Vo IP s y s t ems an d t he pe r f o rman c e a na l ys i s of s e c u r e VOIP n e twor ks . I t s t r e s s e s on t h e u n de r l y i n g of Vo IP p r ot oc ol s l i ke Se s s i o n I n i t i a t i on Pr o to c ol (SIP) , H. 3 2 3 a n d Me di a Ga t ewa y Co nt ro l Pr ot o col (MGCP) . Thi s t he s i s s t r e s s e s mo r e on i s s ue s r e ga r di n g th e f i r ewa l l an d t he p r ob l em f a c e d in u s i n g i t ’ s f o r VoIP; i t f u r t h e r d i s cu s s e s the r e su l t s o bt a i ne d wh en s e c u r i t y me c ha n i sm a r e ap p l i e d. Thi s t he s i s d e ve l o ps a n a l go r i t hm of a n a da pt i ve me t ho d c o de c s e l e c t i o n me c ha ni sm wh i ch c ha n ge s t he v o i c e e nc od i n g s c heme in t he mi d dl e of a n a c t i ve c a l l b a s e d o n the n e two rk c on di t i o n s . Th e p ro p o s ed me c ha ni sm i n vol ve s e s t a b l i s h i n g a th r e e -wa y h a n d sha ke p r oc e s s i n mid - c a l l t o r e - ne g o t i a t e s t a t io n c a pab i l i t i e s , mak i n g t he swi t c h a t a d e t e rmi ne d s e que nc e n umbe r i n a r e a l t ime t r an sp or t p r ot o co l (RTP) p a c ke t t o sol ve t h e p r o bl ems a n d t hen t o i n c r e a s e t he pe r f orma nc e of VOIP.
Description: A t he s i s submi t t ed t o th e s c h oo l of Gr a d ua t e Stu d i e s , Add i s Aba ba Un i ve r s i t y Te c hn ol o gy Fa c u l t y i n p a r t i a l f u l f i lme nt o f t he r eq u i r eme n t s Fo r t he De gr e e o f Ma s t e r o f Sc i enc e i n El e c t r i c a l En gi ne e r in g (Mi c ro El e c t r o n i c s En gi ne e r i n g )
URI: http://hdl.handle.net/123456789/1458
Appears in:Thesis - Electrical Engineering

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