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RESOLVED : 6921 Phone not picking up ip from windows DHCP

ramiz.shaikh1
Beginner
Beginner

there is a strange issue we are facing since long time where few 6921 phones are not picking up valid ip.

They are taking ip as 0.0.0.0.

This is happening with only 6921(irrespective of their firmware version).

Few phones get registered when we change admin vlan to voice VLAN id .

Attached are the snapshots of the packet captures of one affected phone and one working phone

working phone f029295b68ef 

Affected phone 0c2724ba188b

We can see affected phone is taking ip as 0.0.0.0. it taking it for a while and then phone displays IP address realeased.

When we assign IP manually the phone registers immediately.

1 Reply 1

ramiz.shaikh1
Beginner
Beginner
This issue was close to the bug 

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCtg01625/?reffering_site=dumpcr
Upgraded the phone to latest firmware 9-4-1SR3 but it did not help
Raised the concern with TAC and they shared special firmware file(attached) and it resolved the issue
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