[SR-Users] Manipulate sip header on an in-dialog negative reply

Daniel-Constantin Mierla miconda at gmail.com
Thu Dec 20 13:31:11 CET 2018


in the failure route you have the request under processing, not the

You have to use an onreply_route[x] for that transaction and do there


On 20.12.18 11:57, Olli Attila wrote:
> Hello,
> Any ideas about this header manipulation?
> Cheers,
> Olli
> pe 14. jouluk. 2018 klo 12.31 Olli Attila (attiolli at gmail.com) kirjoitti:
>> Hello,
>> We have a call case where our softswitch replies to in-dialog
>> re-invite with "SIP 491 Request pending". This happens when a customer
>> sip device is trying to re-invite the session too fast even though the
>> softswitch is still processing the earlier request. Kamailio operates
>> between this customer device and the softswitch.
>> The softswitch is adding a P-Charging-Vector header to this SIP 491
>> reply which we want to drop (remove_hf...)  from the reply when we
>> route the SIP 491 message  back to the customers device.
>> I tried to drop this inside in-dialog failure route but it seems that
>> Kamailio forwards the orginal 491 message statelessly to customer and
>> the header still extists there eventhough failure route has deleted
>> it. I guess this modification should be done in a sateful manner for
>> Kamailio to actually write the changes to the outgoing reply towards
>> the customer device.
>> Any suggestions how the 491 reply could be edited and then forwarded
>> onwards to the customer device?
>> Cheers,
>> --Olli
Daniel-Constantin Mierla -- www.asipto.com
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