[cisco-voip] IP-Phones NAT problem

Wes Sisk wsisk at cisco.com
Thu Apr 6 13:11:58 EDT 2006


all voip protocols embed the L3 address in the signaling protocol.   
You will need a NAT device that supports a 'fixup' mechanism for  
those protocols.

I know the PIX does.

/Wes

On Apr 6, 2006, at 8:21 AM, Mounir Mohamed wrote:

Dear All,


I have 2 IP-phones connected to C2621 with the below configuration  
the problem that, the phones used 10.0.0.25 and 10.0.0.26 and both is  
NATED on the 2600 router, also both registered in international SIP  
server but thay can not make calls even between each other, But when  
i trying to using static NAT (Private--> Real IP) everything working  
fine but i can not deticate IP for each phone and now the problem due  
to NAT so anybody could help in that, HOw can i use NAT but in the  
same time the phones working because it's seems that the NAT port  
changes it the reason behind the problem

Seef-HQ#sh run
Building configuration...

Current configuration : 1596 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname Seef-HQ
!
logging buffered 4096 debugging
enable secret 5 $1
!
ip subnet-zero
ip cef
!
!
ip name-server 195.219.14.20
ip name-server 64.85.63.6
!
!
!
voice rtp send-recv
!
voice service voip
  sip
!
voice class codec 1
  codec preference 1 g711ulaw
!
!
!
!
!
!
!
no voice hpi capture buffer
no voice hpi capture destination
!
!
!
!
!
!
interface FastEthernet0/0
  ip address 217.X.X.X 255.255.255.240
  ip nat outside
  duplex auto
  speed auto
!
interface FastEthernet0/1
  ip address 10.0.0.1 255.255.255.0
  ip nat inside
  duplex auto
  speed auto
!
ip nat pool LAN 217.X.X.X 217.X.X.X prefix-length 28
ip nat inside source list 10 pool LAN overload
ip nat inside source static tcp 10.0.0.113 80 interface  
FastEthernet0/0 9999
ip nat inside source static 10.0.0.4 217.X.X.Y
ip nat inside source static 10.0.0.3 217.X.X.Z
ip http server
ip classless
ip route 0.0.0.0 0.0.0.0 217.X.X.X
!
!
access-list 10 permit 10.0.0.0 0.0.0.255
!
!
!
!
!
!
dial-peer voice 1 voip
  session protocol sipv2
  session target ipv4:67.X.X.X
  session transport udp
!
sip-ua
  nat symmetric role active
  nat symmetric check-media-src
  retry invite 2
  retry response 2
  retry bye 2
  retry cancel 2
  sip-server ipv4:67.X.X.X


-- 
Best Reagrds,
Mounir Mohamed
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