SIP Provider - Wrong SDP IP

Discussion in '3CX Phone System - General' started by tiagomoreira, Dec 7, 2015.

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  1. tiagomoreira

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    Hello,

    I have a 3CX Phone System V12 6.2.

    Here's the scenario, I'm going to use false IP addresses but I'm sure you'll understand:

    NIC1 - 1.1.1.1
    NIC2 - 2.2.2.2
    Public IP - 3.3.3.3

    We use the NIC1 IP to communicate with internal phones and the public IP to register outside extensions (3CX Phone).

    However, we added a NIC2 interface so that we can communicate with our service provider. We followed the instructions, NO default gateway, and a static route to the provider's IP. So far so good, we have connectivity with no issues.

    At first, everything was wrong, I had to change the SIP parameters to the ones that the provider was hoping to receive (basically the host parts of the parameters), the 3CX always puts the external IP!!!

    The thing is, that when we place an external call passing through the new SIP trunk, I see From: ok, To: ok, P-Asserted Identiy: ok, Contact: ok, but on the SDP messages, I see:
    c=IN IP4 3.3.3.3
    the PUBLIC IP...but why?? How can I change that? I have one way audio because of that (can't hear from the outside), I get "No RTP received from X.X.X.X to Extn IP=3.3.3.3...the provider is always expecting to receive the 2.2.2.2 IP from the NIC2, not the public IP address.

    Can you help me solving that please?

    EDI: I forgot to say that I already changed in VoIP Provider Advanced Tab to use the 2.2.2.2 IP, but no luck.

    Thanks in advance.
     
  2. dig1234

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    They fixed this in v14. I ran into the same issue in 12.5 and upgraded to 14 for this reason. Haven't seen it documented but I confirmed with wireshark. I hear your pain man...

    see my post here:
    http://www.3cx.com/forums/sdp-sending-external-ip-instead-of-contact-setting-ip-43429.html
     
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  3. AndreasP_3CX

    AndreasP_3CX New Member
    3CX Support

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    Hi

    As dig1234 said this has been fixed in V14 so please upgrade your PBX and your issue will be resolved. For any other questions or inquiries feel free to let us know

    Best Regards
     
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