Hi Nizam,
Here is the link to find out the local sales representative of your region -
http://www.cisco.com/cisco/web/siteassets/contacts/index.html#~tab-f
More links to go through regarding the comparison ::
https://www.trustradius.com/compare-products/avaya-vs-cisco-unified-contact-center
https://www.quora.com/What-advantages-does-Cisco-Contact-Centre-Enterprise-CVP-have-over-Avaya-Contact-Centre-how-to-benchmark-both
Regards,
VKV