Help understaning NAT table for SIP

Hi Folks,
I've been battling SIP and NAT for nearly 3 months now I've got to the point where I think I may well have found a bug in IOS. Incoming calls are not getting to my CME, outbound calls are fine. The sip-ua is registered fine.
2611xm-1#show sip-ua register status
Line                              peer        expires(sec) registered
================================ ========== ============ ==========
01xxxxx8882                       -1          86            yes
Without a static route, the NAT translation table on the 877 that connects to the internet looks like this:
877va-1#show ip nat translations
Pro Inside global      Inside local       Outside local      Outside global
udp 82.70.85.118:1024 192.168.1.254:5060 212.23.7.228:5060 212.23.7.228:5060
No incoming calls come through, but looking at the table, I understand why as the ITSP is routing calls to ports 5060, not 1024.
With this static route:
ip nat inside source static udp 192.168.1.254 5060 82.70.85.118 5060 extendable
The table looks like this:
877va-1#show ip nat translations
Pro Inside global      Inside local       Outside local      Outside global
udp 82.70.85.118:5060 192.168.1.254:5060 212.23.7.228:5060 212.23.7.228:5060
udp 82.70.85.118:5060 192.168.1.254:5060 ---                ---
Incoming calls come through, which makes sense as the port is now open!
If I delete the static route, clear the translation table and re-register the sip-ua the table looks like this:
877va-1#show ip nat translations
Pro Inside global      Inside local       Outside local      Outside global
udp 82.70.85.118:5060 192.168.1.254:5060 212.23.7.228:5060 212.23.7.228:5060
Calls come through for around 12 hours (probably until something times out and the sip-ua re-registers to the first scenario on port 1024).
Why is the 877 setting up the translation to port 1024 - what can I do to fix this?
My 877 settings are:
no ip nat service sip udp port 5060
ip nat inside source list 1 interface Dialer1 overload
ip route 0.0.0.0 0.0.0.0 Dialer1
ip route 192.168.2.0 255.255.255.0 192.168.1.254
My CME SIP settings are:
sip-ua
credentials username 01xxxxx8882 password xxxxxxxxxxxxxxxxxxx realm voip.zen.co.uk
authentication username 01xxxxx8882 password 7 xxxxxxxxxxxxxxxxxxxxxxxxx
nat symmetric role active
nat symmetric check-media-src
retry invite 3
retry register 10
timers register 150
registrar dns:voip.zen.co.uk expires 120
sip-server dns:voip.zen.co.uk
connection-reuse
host-registrar
permit hostname dns:voip.zen.co.uk
permit hostname dns:asterisk01.voip.zen.co.uk
permit hostname dns:asterisk02.voip.zen.co.uk

Thanks fo thre reply Daniele.
IOS is 15.3(3)M, but I've updated this today from an ealier version hoping to fix the problem.
If I do the following:
877va-1#show ip nat translations | include 5060
udp 82.70.85.118:1029 192.168.1.254:5060 212.23.7.228:5060 212.23.7.228:5060
877va-1#clear ip nat trans
877va-1#clear ip nat translation *
877va-1#clear ip nat statistics
Then on the CME box, re-register the sip-ua.
877va-1#show ip nat translations | include 5060
udp 82.70.85.118:1030 192.168.1.254:5060 212.23.7.228:5060 212.23.7.228:5060
It takes the next port. Its never using 5060 in the first place from what I can tell

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"Sootica" <[email protected]> wrote in
message
news:[email protected]...
> Could someone look at the starters of a site I'm trying
to get up and
> going?
> The link is here:
>
http://canyoncrestfoundation.org/newhomepage.htm
>
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> basic
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text what "if I
> try to
> type here...". I'm using Dreamweaver 8 and if I move
click on the draw
> table
> button in Layout mode, and then try to move the cursor
over that row, I
> get a
> circle with a line diagonally across the middle. I
really wanted to be
> able to
> have varying layouts in that center part. Also, what do
I do to move the
> top
> text in that row over-- where it says, "Partnering
with..." Thank you! I'm
> feeling very frustrated with this.
Please be kind and
> gentle.
> I'm figuring this out on my own, and am just a
volunteer for the
> foundation.
>

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