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Welcome to Cisco Support Community. We would love to have your feedback.

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New Member

Pix501 Unable to Pre-allocate H225

Pushing h323 over a Ipsec tunnel between two Pix501's running 6.3 code.

Hope this is the correct place, since it is Video related.

Got a old pix 501 that is tossing out these errors:

Unable to Pre-allocate H225 Call Signalling Connection for faddr to laddr is my local video endpoint.

The pix501 has a 10 user license on it. All that is run over this connection is one h323 call to an bridge on the other end.

What gives?


Re: Pix501 Unable to Pre-allocate H225

The "Unable to pre-allocate" message usually means you're running out of memory or available translations.

I'm sending you other mail with a link from where you will be able to download the latest

PIX code (6.3.4). Here is the upgrade procedure for PIX using a TFTP server -

You can download TFTP server from following link:

Once you have downloaded and installed the TFTP server on a workstation, copy the

pix634.bin file in the root directory of the TFTP server. Verify connectivity to TFTP

server from PIX by trying to ping the TFTP server IP address from PIX. Once connectivity

is established, upgradation can be done by implementing only one command:

pix (config)# copy tftp flash

New Member

Re: Pix501 Unable to Pre-allocate H225

thanks for the link, I can snag it off cisco site as I have support for some 515's, 525's.

Never hurts to have the latest OS, that is for sure.

I also check my Xlate's and connections, only using 1 local IP connecting to 3 IP's via the IPsec tunnel. Reduced my H323 call down to 1024k due to quality issues on both sides.