[SR-Users] why msg_apply_changes() from REQUEST_ROUTE only

Andrew Pogrebennyk apogrebennyk at sipwise.com
Tue Dec 22 16:12:03 CET 2015

I have a similar issue with kamailio 4.3.4. I want to append a header to
external 486 or 603 reply. If I got it right I should call append_hf,
not append_to_reply which is for locally generated replies.

I've added append_hf() and in the end of failure route call exit but for
some reason that header does not appear on the wire.
So I have added msg_apply_changes() in failure route to see if it
changes something for me.
1st surprise is that kamailio actually started with this config. 2nd
surprise is that is still doesn't work and throws an error which I
didn't see before:

Dec 22 16:01:34 sp1 (local7.info) proxy[23957]: INFO: <script>: >>>>>>>>
append reply_sock='udp:' in REPLY_ROUTE_NAT -
ID=O4Oh8J6hm5ESJag-hlhXQIcBf6HSuZ2g UA='<null>'
Dec 22 16:01:34 sp1 (local7.err) proxy[23957]: ERROR: tm
[t_reply.c:289]: update_totag_set(): ERROR: update_totag_set: to not parsed

Is that an expected behavior or why can't I append any header in failure


On 12/18/2015 03:55 PM, smititelu wrote:
> Hello,
> I don't understand why msg_apply changes() can be called from
> REQUEST_ROUTE *only*. Can someone explain? Can this be extended to
> Basically I need to call this from FAILURE_ROUTES in order to avoid
> double SDP for rtpengine offers. Searching in the mailing list I could
> see that there could be other means of handling this like keeping and
> reading the SDP from an avp(write/read_sdp_pv), but I find the above
> method pretty straightforward.
> Thanks,
> Stefan

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