Avaya 5400 Series Digital Telephones Avaya 5400 Series Digital Telephones Showing all 3 results Sort by popularity Sort by average rating Sort by latest Sort by price: low to high Sort by price: high to low Sale! Avaya EU24 Expansion Module (700345192, 700381817) $45.00 – $95.00 Select optionsQuick View Avaya 5410 Digital Telephone 700382005, 700345291 $50.00 Add to cartQuick View Sale! Avaya 5420 Digital Telephone 700381627, 700339823 $75.00 $49.98 Add to cartQuick View