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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/1451

Title: THE IMPACT OF EMPLOYING SECURITY MECHANISM ON VOIP NETWORK PERFORMANCE
Authors: Abebe, Demissie
Advisors: Dr . Mohammed Abdo
Copyright: 2008
Date Added: 16-Oct-2008
Publisher: Addis Ababa University
Abstract: Pe r c e iv e d co nv e r s a t i on a l s pe 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 in Vo i c e o v e r IP (Vo IP) a ppl i c a t i on s . As IP n e two r ks a r e not d e s i gn ed f o r r e a l - t ime a pp l i c a t io ns , t h e n e two rk imp a i rmen t s su c h a s p a ck e t lo s s , j i t t e r a nd d e l a y h a ve a s e ve r e imp a c t on s p e e ch q u a l i t y. Sin c e Se cu r i t y h a s b e come a ma j o r c o n c e r n wi t h th e r a p id gr owth o f i nt e r e s t in t h e In t e r n e t , t he th e s i s de a l s wi th t h e s e cur i t y a s p e c t s o f Vo IP s ys t ems an d t h e p e r fo rma n c e ana l ys i s of s e cu r e VOIP n e two rk s . I t s t r e s s e s o n th e u n de r l yi n g o f Vo IP p ro to c ol s l ik e Se s s io n In i t i a t i on Pro to c ol (SIP) , H.3 2 3 a nd Me di a Ga t ewa y Co nt r ol Prot o col (MGCP) . Thi s t h e s i s s t r e s s e s mo r e on i s s u e s r e ga r d in g t h e f i r ewa l l a nd th e p r ob l em f a c ed i n u s i n g i t ’ s f o r Vo IP; i t f u r th e r d i s cus s e s t h e r e s ul t s o bt a i n ed wh en s e c ur i t y me c h an i sm a r e a pp l i ed . Thi s th e s i s d e v e lo ps an a l go r i thm o f a n a d ap t iv e me t ho d c od e c s e l e c t io n me ch an i sm whi c h c h an ge s th e v oi c e en co di n g s c h eme in t h e mid dl e of a n a c t iv e c a l l ba s ed o n t h e n e two rk c on di t io ns . Th e pr op os e d me c ha ni sm in vo lve s e s t a bl i sh in g a t h r e e -wa y h a n d sh ak e p r o c e s s i n mid - c a l l t o r e - ne go t i a t e s t a t i on c ap ab i l i t i e s , maki n g the swi t c h a t a d e t e rmin e d s eq u enc e numb e r in a r e a l t ime t r a ns po r t p r ot oc ol (RTP) p a c k e t to sol v e th e p r obl ems an d th en to i n c r e a s e th e pe r f o rman c e of VOIP.
Description: A t he s i s s ubmi t t e d t o th e s ch oo l of Gr a d u a t e Stu di e s , Add i s Ab ab a Un i v e r s i t y Te c h n o lo gy Fa c u l t y in p a r t i a l f u l f i lme nt o f t h e r e q ui r eme nt s Fo r t h e De gr e e o f Ma s t e r o f Sc i e n c e in El e c t r i c a l En gi n e e r in g (Mi c ro El e c t r on i c s En gin e e r i n g) .
URI: http://hdl.handle.net/123456789/1451
Appears in:Thesis - Electrical Engineering

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