[SR-Users] Kamailio not forwarding call

Gonzalo Gasca Meza gascagonzalo at gmail.com
Sat Apr 22 19:01:29 CEST 2017


After packet capture, looks like call is in fact being forwarded to Twilio,
will check with them.

Thanks

-Gonzalo

On Sat, Apr 22, 2017 at 12:17 AM Gonzalo Gasca Meza <gascagonzalo at gmail.com>
wrote:

> Hi all,
>
> I worked in an prototype recently where I *had* the following setup
> working. Kamailio is using Postgres to forward the call to Twilio domain.
>
> *Topology:*
> SIP client (tls) > (SIP Provider) > (tls) Kamailio (udp)  > Twilio > IVR
>
>
> Right now when I call from SIP Client to IVR, call is not forwarded.
> Nothing has changed on Kamailio side.
>
> *Troubleshooting:*
>
> a) *SIP client (tls) > (SIP Provider) > (tls) Kamailio (udp)  > Twilio >
> IVR [Fails]* - Case described above.
> b) *Call from PSTN > (SIP Provider) > (tls) Kamailio (udp)  > Twilio >
> IVR [Works]*
>
> I debug and call arrives to Kamailio but is not being forwarded to Twilio.
> This used to work before.
> When call works Kamailio seems to find remote domain, when fails we just
> sent a *502 Bad Gateway* message
>
> Twilio does not support DNS SRV records, just A host resolution.
>
> *Logs*
>
> While looking at debugs I found that this DNS logs:
> Pastebin below:
>
> *Call fails <https://pastebin.com/ttkK1Kkd> *
>
> Apr 22 06:37:00 parzee-sip-kamailio1 /usr/local/sbin/kamailio[28476]:
> DEBUG: <core> [dns_cache.c:537]: _dns_hash_find(): (_sip._
> udp.parzee.sip.twilio.com(31), 33), h=816
> Apr 22 06:37:00 parzee-sip-kamailio1 /usr/local/sbin/kamailio[28476]:
> DEBUG: <core> [resolve.c:741]: get_record(): lookup(_sip._
> udp.parzee.sip.twilio.com, 33) failed
> Apr 22 06:37:00 parzee-sip-kamailio1 /usr/local/sbin/kamailio[28476]:
> DEBUG: <core> [dns_cache.c:864]: dns_cache_mk_bad_entry(): (_sip._
> udp.parzee.sip.twilio.com, 33, 60, 1)
> Apr 22 06:37:00 parzee-sip-kamailio1 /usr/local/sbin/kamailio[28476]:
> DEBUG: <core> [dns_cache.c:798]: dns_cache_add(): adding _sip._
> udp.parzee.sip.twilio.com(31) 33 (flags=1) at 816
> Apr 22 06:37:00 parzee-sip-kamailio1 /usr/local/sbin/kamailio[28476]:
> DEBUG: <core> [dns_cache.c:537]: _dns_hash_find(): (parzee.sip.twilio.com(21),
> 1), h=267
> Apr 22 06:37:00 parzee-sip-kamailio1 /usr/local/sbin/kamailio[28476]:
> DEBUG: <core> [resolve.c:937]: get_record(): skipping 0 NS (p=0xa1d2e7,
> end=0xa1d2e7)
> Apr 22 06:37:00 parzee-sip-kamailio1 /usr/local/sbin/kamailio[28476]:
> DEBUG: <core> [resolve.c:952]: get_record(): parsing 0 ARs (p=0xa1d2e7,
> end=0xa1d2e7)
> Apr 22 06:37:00 parzee-sip-kamailio1 /usr/local/sbin/kamailio[28476]:
> DEBUG: <core> [dns_cache.c:1741]: dns_get_related(): (0x7f1b5c227920 (
> parzee.sip.twilio.com, 1), 1, *(nil)) (0)
> Apr 22 06:37:00 parzee-sip-kamailio1 /usr/local/sbin/kamailio[28476]:
> DEBUG: <core> [dns_cache.c:840]: dns_cache_add_unsafe(): adding
> parzee.sip.twilio.com(21) 1 (flags=0) at 267
>
>
> *Call works <https://pastebin.com/AkWsvFVA>*
>
> Apr 22 07:00:03 parzee-sip-kamailio1 /usr/local/sbin/kamailio[28481]:
> DEBUG: <core> [dns_cache.c:537]: _dns_hash_find(): (_sip._
> udp.parzee.sip.twilio.com(31), 33), h=816
>
> Apr 22 07:00:03 parzee-sip-kamailio1 /usr/local/sbin/kamailio[28481]:
> DEBUG: <core> [resolve.c:741]: get_record(): lookup(_sip._
> udp.parzee.sip.twilio.com, 33) failed
>
> Apr 22 07:00:03 parzee-sip-kamailio1 /usr/local/sbin/kamailio[28481]:
> DEBUG: <core> [dns_cache.c:864]: dns_cache_mk_bad_entry(): (_sip._
> udp.parzee.sip.twilio.com, 33, 60, 1)
>
> Apr 22 07:00:03 parzee-sip-kamailio1 /usr/local/sbin/kamailio[28481]:
> DEBUG: <core> [dns_cache.c:798]: dns_cache_add(): adding _sip._
> udp.parzee.sip.twilio.com(31) 33 (flags=1) at 816
>
> Apr 22 07:00:03 parzee-sip-kamailio1 /usr/local/sbin/kamailio[28481]:
> DEBUG: <core> [dns_cache.c:537]: _dns_hash_find(): (parzee.sip.twilio.com(21),
> 1), h=267
>
> Apr 22 07:00:03 parzee-sip-kamailio1 /usr/local/sbin/kamailio[28481]:
> DEBUG: <core> [msg_translator.c:2876]: create_via_hf(): id added: <;i=7>,
> rcv proto=3
>
> Apr 22 07:00:03 parzee-sip-kamailio1 /usr/local/sbin/kamailio[28481]:
> DEBUG: <core> [msg_translator.c:158]: check_via_address(): (54.172.60.0,
> 54.172.60.0, 0)
>
> Apr 22 07:00:03 parzee-sip-kamailio1 /usr/local/sbin/kamailio[28481]:
> DEBUG: tm [t_funcs.c:368]: t_relay_to(): SER: new transaction fwd'ed
>
> Thank you!
>
>
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