[cisco-voip] 3750 switch loses packets when pinging ip phones

[gokhan senol]

Hi

i got 3750 switch and 7940 and 7960 ip phones.
when i trp to ping ip phone from switch i lost lots of the packets. and this prevents ip phone registration to CCM.
c3750-ipbase-mz.122-25.SEB2.bin

ip phone ip address is a.b.c.155

thats the config

interface FastEthernet1/0/2
 switchport mode access
 switchport voice vlan 20
 spanning-tree portfast


interface Vlan1
 no ip address
!
interface Vlan10
 description ----DATA VLAN----
 ip address x.y.z.131 255.255.255.128
 !
interface Vlan20
 description ----VOICE VLAN----
 ip address a.b.c.129 255.255.255.128

i tried 3 phones and changed the cable but the problem is still going on.
anyone has any idea

thknx


 
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