Avaya 9650 phones losing lease

[ruspola]

Hello,

Our 9650 phones get a lease of 3 hours and everything looks fine on the DHCP until the lease expires
The phones keep their ip address but the lease is dropped after 3 hours.
Not sure why this happens.
The phones pick up the 242 option on the data and voice subnet scopes , pick up a ip address correctly on the voice subnet and register fine

The lease time on the DHCP is set to 3 hours but it seems the phones are not sending another DHCPrequest to renew the lease
Has anyone any ideas?
Thanks

 

[kyle555]

DHCP REUSE is a setting that by default has the phones continue reusing the IP after lease expiry. If they didn't do that, they'd drop the IP they had before they got another and would go offline based on DHCP lease timers regardless of whether the phone was on a call or not.

 

[jimbojimbo]

I think the recommendation is still to extend DHCP lease time out to 30 days+. The phone should renew the DHCP. You might need a wireshark trace to prove it. You might want to make sure you are on the latest software (3.2.7).

You might also want to look at DHCPSTD and REUSETIME in the 46xxsettings.txt file.

The phone needs to be able to keep the same IP Address or you will have loss of audio on the calls. Changing the IP Address requires re-registration to CM. The existing RTP audio stream would no longer be valid.