Expressway E Call disconnection

[sandip.khandekar]

Call disconnection issue in Expressway E;

When we are making a B2B  incoming calls, the call arrives on the CMS bridge and disconnects after a differential time of span 15 or 30 minutes.

We have analyzed logs and found that :

when Our end expressway E send re-invite message to far end but far end some time did not receive re-invite message .

our Expressway E send request timeout message to expressway C and calls got disconnected.

For the setup we have below parameters:

We have expressway setup single NIC with single subnet.

1. Expressway C 10.20.30.18
2. Expressway E 10.20.30.19 NATED IP 14.X.X.X ( Public IP)

We have configured NAT reflection on firewall for B2B calls.

1 Expressway C(10.20.30.18) Zone configuration:

We have mentained public IP of expressway E in expressway C Zones.

Traversal client Zone
Peer Address:14.X.X.X

2 Expressway E ( 10.20.30.19) Traversal zone :

Expressway E reaches with expressway C via Firewall IP i.e 10.20.30.1 instead of expressway C IP(10.20.30.1)

Connection 1 SIP: Reachable: 10.20.30.1:25001

is this correct way ?

3 DR Side expressway:( single NIC with single subnet)

expressway C

                     -----------Firewalll-1 --------Firewall -2 -------Router-------Internet link

expressway E 

On which firewall should the NAT reflection be done ?

Could you please let us know:

1 will this deployment work ?

2 What would be the reason for  re-invite message not reaching far end ?

[Anurag Srivastava1]

Hello,

Have you checked the far end logs and sure that Re-invite is not reaching to them?

If its not reaching i will rather say involve your firewall team and investigate more on firewall side.

Also make sure SIP ALG is off on external firewall.

And NAT should be done on firewall 2 (external) one.

Thanks

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