Help with CME and incoming sip calls.

alexten1983 · ‎07-19-2017

I have CME setup on SIP and out bound works good. The thing is I have it setup behind a home router on privet IP address. When the calls come is it hits the CME but it hits it with a public ip address.

SIP/2.0 400 Bad Request - 'Invalid Host'

To: <sip:3475416554@100.2.251.57:55158;transport=tcp>;tag=1890CC7C-1758

but the ip of CME is 192.168.1.6

I did come across this but didn't try it as my ip is dynamic.

NAT Traversal

If your CUBE is behind a NAT and does not have a public IP, you need to modify the IPs in the SIP messages to your public IP using SIP Profiles as shown below:

In global configuration mode

voice class sip-profiles 1
response ANY sip-header Contact modify "172.x.y.z" "1.2.3.4" !1.2.3.4 Public IP; 172.x.y.z Private IP of the CME
request ANY sip-header Contact modify "172.x.y.z" "1.2.3.4" 
response ANY sdp-header Audio-Connection-Info modify "172.x.y.z" "1.2.3.4"
response ANY sdp-header Connection-Info modify "172.x.y.z" "1.2.3.4"
response ANY sdp-header Session-Owner modify "172.x.y.z" "1.2.3.4"
request ANY sdp-header Audio-Connection-Info modify "172.x.y.z" "1.2.3.4"
request ANY sdp-header Connection-Info modify "172.x.y.z" "1.2.3.4"
request ANY sdp-header Session-Owner modify "172.x.y.z" "1.2.3.4"

This can then be applied either globally to the general sip config or under the dial-peer config using:

voice-class sip profiles 1

Additionally, it is advisable to define a loopback interface and configure it with your public IP address. Do not advertise this into your network though, as it may cause other problems.

In global configuration mode

interface loopback 0
ip address 50.249.214.241 255.255.255.0

Inbound calling:

Use translation rules and translation profiles to translate your DIDs to extensions.

Create a voice translation rule. For example, the rule below translates 13125489677 to 3005

In global configuration mode

voice translation-rule 100
rule 1 /13125489677/ /3005/   !  Several rules can be defined. In this case, 3005 is an extension on CUCM

Create a translation profile using the rule created:

In global configuration mode

voice translation-profile 100
translate called 100

Apply the translation profile to the dial-peer:

translation-profile incoming 100

alexten1983 · ‎07-19-2017

Ok I got it to work on incoming with the above suggestion.

dditionally, it is advisable to define a loopback interface and configure it with your public IP address. Do not advertise this into your network though, as it may cause other problems.

In global configuration mode

interface loopback 0
ip address 50.249.214.241 255.255.255.0

How do I make sure it is not being advertise?

And If this setting works what is the best way to go about it as the public ip might change?

alexten1983 · ‎07-25-2017

Plase some one help as the public ip changed and incoming stopped working here is my set up.

home asus router with a dhcp from isp seting -> CME 8.0 on privet ip.

Here is the config with old isp IP when it was working till the isp ip changed.

sip
bind control source-interface GigabitEthernet0/0.10
bind media source-interface GigabitEthernet0/0.10
registrar server expires max 1800 min 1800
!
voice class codec 1
codec preference 1 g711ulaw
codec preference 2 ilbc
codec preference 3 g729r8
!
voice class sip-profiles 1
request ANY sip-header Contact modify "192.168.1.6" "100.2.254.60"
response ANY sdp-header Audio-Connection-Info modify "192.168.1.6" "100.2.254.6
0"
response ANY sdp-header Connection-Info modify "192.168.1.6" "100.2.254.60"
response ANY sdp-header Session-Owner modify "192.168.1.6" "100.2.254.60"
request ANY sdp-header Audio-Connection-Info modify "192.168.1.6" "100.2.254.60
"
request ANY sdp-header Connection-Info modify "192.168.1.6" "100.2.254.60"
request ANY sdp-header Session-Owner modify "192.168.1.6" "100.2.254.60"

interface Loopback0
ip address 100.2.254.60 255.255.255.0
!
interface GigabitEthernet0/0
no ip address
duplex auto
speed auto
!
interface GigabitEthernet0/0.10
description DataVlan
encapsulation dot1Q 10
ip address 192.168.1.6 255.255.255.192
ip helper-address 192.168.1.2
ip nat outside
ip virtual-reassembly in
!
interface GigabitEthernet0/0.100
description VOICE Vlan
encapsulation dot1Q 100
ip address 192.168.10.1 255.255.255.240
ip helper-address 192.168.10.2
ip nat inside
ip virtual-reassembly in
!
interface GigabitEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
ip forward-protocol nd
ip http server
no ip http secure-server

ip route 0.0.0.0 0.0.0.0 192.168.1.1