Cisco ASA 5510 Pair Upgrade 8.21->8.47->9.14 Proxy Phones and VPN Tunnels

I am planning to upgrade my 5510 ASA pair as described  in the subject.  I am hoping to use the procedure at this petenetlive URL..

http://www.petenetlive.com/KB/Article/0000733.htm

A few concerns.  

Will upgrading from 8.21 to 8.47 and then 8.47 to 9.14 be a good sequence?

Is there any risk to the functionality of my CIsco Proxy phones?  I have about 20 deployed around the country and I am concerned that the upgrade could leave some sales reps without phone service if there's an incompatibility.  Any issues to consider there??

Is there any risk to a VPN tunnel to another ASA 5510 pair which is still using 8.21?  That would likewise be very bad
if after the upgrade I could no longer get to the remote site.  Anything need to be reconfigured on either side after the upgrades?
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amigan_99Network EngineerAsked:
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Soufiane Adil, Ph.DIT, Network Architect - CCNP/CCDPCommented:
Why you wanna upgrade ?
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amigan_99Network EngineerAuthor Commented:
The primary issue is that I need to apply an upgrade license to accommodate more proxy phones.  I'm at 20 or 24.  I purchased the upgrade I think to 48 phones.  But when I got it I realized it was only associated with the primary member of the pair.  I was told that if I upgraded to 8.4 or beyond that the proxy phone license then works for both primary and the secondary unit.   If I apply the upgrade license to the primary and at some point it went out - then some of my remote users would be unhappy.  But if you see a flaw in my logic I'm all ears.
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Pete LongTechnical ConsultantCommented:
>>Will upgrading from 8.21 to 8.47 and then 8.47 to 9.14 be a good sequence?

Yes in fact Im doing the exact same thing on Saturday! :)

>>Is there any risk to a VPN tunneil to another ASA 5510 pair which is still using 8.21

Not that I have seen- you are into introducing an IKEv2 capable firewall at one end, but both are still running IKEv1 :)

As for the phones I cant comment :( But as usual back up everything first, have copies of all the OS bin files and ASDM bin files. Before attempting an upgrade.

And thanks for the site plug!

Pete
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amigan_99Network EngineerAuthor Commented:
Thanks Pete!  I'm getting close on my change doc.  I'm still worried about the proxy phone operation.  That will cause a major ruckus if that stops working.  What I think I'll do is..

>Reboot the failover after upgrade.

5510-1 (config)# failover reload-standby

..And then I will test all of the functionality including the proxy phone operation.  If all is good then I reload and activate the primary.  
If anything's amiss then I can simply take the secondary ASA offline, verify that the bootvar on primary remains as the original and activate it at pre-upgrade level.
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Pete LongTechnical ConsultantCommented:
Sounds like a plan :)

ThanQ
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