NAT to resolve IP address conflict issue

I have a task to help Company A for a join venture project, the network diagram as attached. The task requirements as following:

1.) Both company IP address cannot be modified

2.) Company A 10.1.99.0/24 segment can access Company B server SRV5 and SRV6, and also their own Company A server SRV1, SRV2 and SRV3.

3.) Company A Firewall NAT setting cannot be modified

4.) Company B 10.1.0.0/16 segment can access Company A server SRV1

Base on the above requirements, actually only R1 router under my control and the diagram can show you that both company IP address are conflicted, seems the NAT setting is required to achieve the goal. I have try to use the following NAT and routing setting on R1 as following but it totally doesn't work :(

int f0/0
ip nat inside

int S0/0
ip nat outside

ip nat inside source static 10.1.99.100 10.99.1.100
ip nat outside source static 10.1.1.100 10.10.10.100
ip nat outside source static 10.1.1.200 10.10.10.200

R1 routing table as following:

0.0.0.0 0.0.0.0 10.1.99.1
10.10.10.0 255.255.255.0 172.16.1.2

On R2 they have add a routing entry as following:

10.99.1.0 255.255.255.0 172.16.1.1

Any experts can help me please?????????????????? Many Thanks Diagram
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gcl_hkAsked:
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ujitnosConnect With a Mentor Commented:
Ok.. Lets say we configure (NAT, actual ip will remain 10.1.99.100) the SRV 4 with IP address 192.168.1.2/24.

so, Users in company A will access the server SVR4 with 192.168.1.2. You will need to configure routes in company A firewall to forward traffic for srv4 to R1, now in R1 configure routes to forward traffic to R2 of company B. Now either in R2 or firewall of company B do a NAT resolution to the actual IP 10.1.99.100.
Users in Company B will access SRV4 with IP 10.1.99.100, but they wont be able access SRV1 from Company B as traffic will always go to SRV4.

Try and let me know.
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ujitnosCommented:
I feel that as both the server SRV1 and SRV4 have the same IP, it wont be possible to configure a NAT too. Either change one of the servver's IP or configure rules to a specific port.

Suppose the SRV4 is listening on port 1521 then confiure ruels in Company A to route traffic for SRV4:1521 to R2
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gcl_hkAuthor Commented:
Thanks for your comment ujitnos.

Do you mean NAT on only R1 is impossible to solve this issue? Also, what do you mean of rules for specific port? But actually all SRV server is running http service, is this method can work as well.
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