[SIPForum-discussion] originator of call

[Rohan Almeida]

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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>>
>