I've found a message relating to this below. I'm not sure if it's the same problem that you have?.
Problem
IP Phones slow responding to TPS query hookswitch messages resulting
in no keys showing and unable to dial out.
Details and Fix
Details:
Additional data networking switches/routers added to a customers network resulting in no keymaps showing on any of the IP phonesets.
The following is an example of one of the messages seen on the sig servers, hosting the IP Phone registrations, at the time the customer was testing the additional data networking switches:
LOG0003 SET: Keymap download failed, pdset 0x30d244cc, tn=0xa215, ip=10.230.140.122, retry of hookswitch 61
Fix:
Applying sig server patch mplr24199_2 increases the timer from 3 to 5 seconds, for the time that the TPS expects to receive a response, from and IP Phone, when it sends out a QueryHookSwitch message.
This patch takes into account addtional delay induced into a customers network from addding extra hops/routers/layer 3 switches into the IP network.
SPECIAL INSTRUCTIONS:
There are no special instructions for loading the patch, however, if you need to remove the patch without rebooting the sig server you MUST do the following:
1) Type dsetDelayHookswitchSet 'restore',0 from vxshell
2) Type poos
3) Type dsetDelayHookswitchSet '1175',3000
All the best
Firebird Scrambler
Meridian 1 / Succession and BCM / Norstar Programmer in the UK
If it's working, then leave it alone!.