One of my engineers is encountering a problem when attempting to implement IKEY-IBAKE within pjsip. Please see the following:
I'm currently trying to adapt "pjsua" to handle a MIKEY-IBAKE exchange.
This requires session attributes to contain the following message flow within the SDP:
Initiator Responder
--------------------------------------------------------------------
I_MESSAGE_1 --> : In INVITE message
<-- R_MESSAGE_1 : In response
I_MESSAGE_2 -->
<-- R_MESSAGE_2
I have created a transport adaptor which creates a MIKEY-IBAKE attribute depending on the IBAKE message type in the function "transport_encode_sdp"
I have a number of problems at the moment.
1: How do I prevent the call being connected immediately? I have tried auto-answering with a code 183 - Session In Progress in the hope it would trigger another call to "transport_encode_sdp".
I need to prevent the call being established until after R_MESSAGE_2 has been received by the call initiator.
2: Where would I expect to be able to process attributes in the responses?
Do you know of any multiple message exchange examples?
I would be extremely grateful if the Group could assist here.
Many thanks...
Tim McLeod MBCS CITP
Principal Engineer
Tel: +44 1633 715097
Mob: +44 7765 088364
Email: tim.mcleod at cassidian.com<mailto:tim.mcleod at cassidian.com>
RLI: tim.mcleod at eads.r.mil.uk<mailto:tim.mcleod at eads.r.mil.uk>
Website: www.cassidian.com<http://www.cassidian.com/>
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