[SIPForum-discussion] originator of call

[Thompson, Dantley]

Anyone out there had issues terminating inbound to the "FreePBX" based
off the Asterisk SIP stack...Getting 401 unauthorized inbound, but pbx
vendor claims he is not challenging. Modified the headers to only use
IP, and several other attempts at moving, adding, or deleting...Pretty
much threw the book at this, but continue to struggle. Any advice would
be greatly appreciated...

Dantley Thompson | Systems Engineer  


-----Original Message-----
From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Rohan Almeida
Sent: Tuesday, June 14, 2011 9:39 AM
To: Ankit Agarwal; satyadarshi28 at gmail.com
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] originator of call

Hi,

you can can check the Max-forwards header. if the header is less than
default(70) then you can conclude that it has come from proxy.

------------------------------------------------------------------------
----------------------------------

      INVITE sip:bob at biloxi.com SIP/2.0
      Via: SIP/2.0/UDP pc33.atlanta.com;branch=z9hG4bK776asdhds
      Max-Forwards: 70
      To: Bob <sip:bob at biloxi.com>
      From: Alice <sip:alice at atlanta.com>;tag=1928301774
      Call-ID: a84b4c76e66710 at pc33.atlanta.com
      CSeq: 314159 INVITE
      Contact: <sip:alice at pc33.atlanta.com>
      Content-Type: application/sdp
      Content-Length: 142
------------------------------------------------------------------------
----------------------------------

Max-Forwards  =  70   in the above request -> no proxy

------------------------------------------------------------------------
----------------------------------

      INVITE sip:bob at biloxi.com SIP/2.0
      Via: SIP/2.0/UDP pc33.atlanta.com;branch=z9hG4bK776asdhds
      Max-Forwards: 69
      To: Bob <sip:bob at biloxi.com>
      From: Alice <sip:alice at atlanta.com>;tag=1928301774
      Call-ID: a84b4c76e66710 at pc33.atlanta.com
      CSeq: 314159 INVITE
      Contact: <sip:alice at pc33.atlanta.com>
      Content-Type: application/sdp
      Content-Length: 142
------------------------------------------------------------------------
----------------------------------

Max-Forwards  =  69   in the above request   ->  proxy


There is a catch here that if the the endpoint has changed the default
'max-forwards' value then you have to knw the new value for 'max
forwards' header.


Satyadarshi: as incdicated by Ankit knowing your exact requiremant
will be more helpful.

regards,
Rohan Almeida

On 6/7/11, Ankit Agarwal <clickankit4u at gmail.com> wrote:
> Vijay,
>
> This is not mandate even because if endpoint is behind SBC which is
capable
> of doing Topology hiding then Invite will be having only one VIA which
will
> be of SBC not of endpoint.
>
> Satyadarshi: At the same time it could be better if you could tell
your
> requirement where you need to find out if endpoint is from proxy or
> endpoint.
>
> Ankit Agarwal
>
>
>
>
> On Mon, Jun 6, 2011 at 5:20 PM, Vijay Tiwari
<vijay11tiwari at gmail.com>wrote:
>
>> Hello Satyadarshi
>>
>> If in the Invite message you have only one *Via header* it means its
>> coming from EP.
>>
>> Thanks
>>
>> On Sun, Jun 5, 2011 at 12:12 AM, K Satyadarshi
>> <satyadarshi28 at gmail.com>wrote:
>>
>>>  Hi Forum,
>>>
>>> Can some one please tell me which header in the sip message
indicates
>>> that
>>> a particular sip message is comng from an EP and not from the proxy.
>>>
>>> --
>>> K Satyadarshi
>>> Email: satyadarshi28 at gmail.com
>>> Cell:   +91-9449112443
>>>
>>>
>>> _______________________________________________
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>>>
>>
>>
>> --
>> They can because they think they can.
>>
>>
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>>
>
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