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  • SIP devices behind ADSL lines

    Hi all,

    I am new to the community here and also to Shoretel and also to VOIP.

    We would like to connect SIP devices behind several different ADSL lines to a SG headquarters sitting on a static IP (196.211.172.43). To save on costs, We would like to do this without using a Siperator. Also, we think we don't need a siperator as there will be NO transferring of calls i.e. we simply want to call from a remote SIP device into an IP Phone on the SG HQ.
    Question 1: Can we do the above without using a SIPerator? If not, then why not?

    The firewall/router in front of the SG has been setup to forward all incoming traffic on public 196.211.172.43 to the SG on private 10.99.0.12.

    As a 1st test, I ran XLite on my PC on the local lan (10.99.0.101) and I connected this to the SG (10.99.0.12) also on the local Lan.
    SIP registration was OK and I could make calls between the Xlite SIP extension and the SG IP phone.

    As a 2nd test, I then moved the xlite pc in front of the firewall/router and I assigned it a public address of 196.211.172.41.
    I also pointed it to 196.211.172.43 for the SIP registration . At this stage the Xlite would not register. It seems as if the SG sends back a FORBIDDEN Message. The following is a wireshark trace of the message.
    REGISTER sip:196.211.172.43 SIP/2.0
    Via: SIP/2.0/UDP 196.211.172.41:38388;branch=z9hG4bK-d8754z-51479d764845ff10-1---d8754z-;rport
    Max-Forwards: 70
    Contact: <sip:[email protected]:38388;rinstance=c1f018bd 9223e109>
    To: "Roger Rand"<sip:[email protected]>
    From: "Roger Rand"<sip:[email protected]>;tag=ab2b2e46
    Call-ID: ZWU1NmRkNDIyODQwM2Y2M2Q5ZjVlYWU1MmVjZWViMzE.
    CSeq: 1 REGISTER
    Expires: 3600
    Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
    User-Agent: X-Lite release 1103d stamp 53117
    Content-Length: 0

    SIP/2.0 403 Forbidden
    Via: SIP/2.0/UDP 196.211.172.41:38388;branch=z9hG4bK-d8754z-51479d764845ff10-1---d8754z-;rport
    From: "Roger Rand" <sip:[email protected]>;tag=ab2b2e46
    To: "Roger Rand" <sip:[email protected]>;tag=shorUA_1378736816-108434846
    Call-ID: ZWU1NmRkNDIyODQwM2Y2M2Q5ZjVlYWU1MmVjZWViMzE.
    CSeq: 1 REGISTER
    Content-Length: 0

    Question 2: Can anyone tell me why this would return a Forbidden message?

    As a 3rd test, I moved the Xlite pc behind the ADSL line, but as expected in test 2 this also didn't work.

    Any help would be appreciated.

  • #2
    I have the same issue with a SIParator on the LAN with the "SIP 403 Forbidden"
    when trying to transfer the call.

    Comment


    • #3
      Sip

      I know very little about this, but I believe the SIPARATOR is necessary when you are trying to NAT the sip traffic. NAT and SIP traffic do not play well.

      there are some SIP aware firewalls... (basically a siparator).

      I would imagine all your failed tests came when you had a NAT somewhere in the mix?

      Take this with a grain of salt though, I am going off of memory from a while ago.

      Comment

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