So, I have a bit of a problem getting out Natted Cisco 7960 working with our external SIP providers behind NAT.
We have a block of IPs available to us, however when I asign a static NAT rule for the internal phone, outgoing calls are fine but incoming provides no audio.
We have no ACL blocking or anything, it's fully open to the outside world with the IP assigned to it via NAT.
Our static NAT rule for the phone:
ip nat inside source static 192.168.0.250 xxx.xxx.xxx.xxx
NAT is configured on the phone, with the external IP set correctly.
Also, after a while, it seems as the the registration times out or something because incoming calls no longer work.
I thought a static NAT rule would just allow full access to incoming connections to the internal IP specified?
Your help, thoughts, suggestions and tips are greatly appreciated.
Our main router config (with unnecessary information removed):
version 15.1
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname r1.essex.xxxx.xxx
!
boot-start-marker
boot system flash c880data-universalk9-mz.151-4.M3.bin
boot-end-marker
!
!
no logging buffered
enable secret 5 xxxxxx
enable password xxxxxx
!
no aaa new-model
memory-size iomem 10
no ip source-route
!
!
!
ip dhcp excluded-address 192.168.0.1
ip dhcp excluded-address 192.168.0.50 192.168.0.255
!
ip dhcp pool NET-POOL
network 192.168.0.0 255.255.255.0
default-router 192.168.0.1
dns-server 8.8.8.8 8.8.4.4
!
!
ip cef
ip name-server 8.8.8.8
ip name-server 8.8.4.4
no ipv6 cef
!
!
!
!
!
!
!
!
controller VDSL 0
!
no ip ftp passive
!
!
!
!
!
!
!
interface Ethernet0
no ip address
!
interface Ethernet0.101
encapsulation dot1Q 101
pppoe-client dial-pool-number 1
!
interface ATM0
no ip address
shutdown
no atm ilmi-keepalive
!
interface FastEthernet0
no ip address
!
interface FastEthernet1
no ip address
shutdown
!
interface FastEthernet2
no ip address
shutdown
!
interface FastEthernet3
no ip address
shutdown
!
interface Vlan1
ip address 192.168.0.1 255.255.255.0
ip nat inside
ip virtual-reassembly in
ip tcp adjust-mss 1452
!
interface Dialer0
ip address 81.138.131.190 255.255.255.248
no ip redirects
no ip unreachables
no ip proxy-arp
ip mtu 1492
ip nat outside
ip virtual-reassembly in
encapsulation ppp
dialer pool 1
ppp authentication chap callin
ppp chap hostname xxxxxxxx
ppp chap password 0 xxxxxxxxx
ppp ipcp route default
no cdp enable
!
ip forward-protocol nd
no ip http server
ip http secure-server
!
ip nat inside source list 101 interface Dialer0 overload
ip nat inside source static 192.168.0.250 xxx.xxx.xxx.xxx <-- THE PHONE's STATIC RULE
!
access-list 101 permit ip any any
!
!
!
!
!
