[Freeswitch-users] Is there a way to deal with "false ring-back than 503" carriers?

[Sergey Okhapkin]

Unfortunately 183 from the second gateway will not override the first one. It's 
how SIP offer/answer works. Once media IP provided to calling party, it can't 
be changed.

Set "continue_on_fail=true" and do not set bypass_media.

On Wednesday 03 February 2016 16:58:09 Victor Chukalovskiy wrote:
> Thank you! Hypothesising there is a way to ontinue to #2 while in
> bypass_media, as soon as I get 183 SDP from the 2nd carrier, wouldn't it
> override bogus 183 SDP from the first carrier? It's not an ideal
> scenario to have two distinct 183's on the same call, but should be
> doable, no?
> 
> In proxy_media, is there an additional param or var I'd need in order to
> continue to #2? Would that be ignore_early_media, or something else?
> 
> On 16-02-03 04:48 PM, Sergey Okhapkin wrote:
> > You can't continue in bypass media mode because (wrong) media IP/port
> > already sent to your downstream. Even if the second gateway completes the
> > call OK, you will get one way audio.
> > 
> > So either proxy the media or fail the call.
> > 
> > On Wednesday 03 February 2016 15:07:29 Victor Chukalovskiy wrote:
> >> Hello,
> >> 
> >> A downstream carrier would accept INVITE, send 183 w/SDP, and almost
> >> instantaneously respond "503". This kills the call not letting re-route
> >> to the next carrier.
> >> 
> >> Without calling any specific names, this seems to become more common.
> >> Unfortunately, often the offending carrier is a few steps down the call
> >> path and I can't reach them with a cluebat.
> >> 
> >> Is there a way to make FS not fail the call and try the next route if
> >> using LCR as per below? Note that we are in bypass_media mode:
> >> 
> >> <action application="set" data="bypass_media=true"/>
> >> <action application="bridge"
> >> data="lcr/lcr_profile/${destination_number}"/>
> >> 
> >> Or to keep it simple, forget LCR for a moment, can we make it go to
> >> gateway_2 in the following example if gw1 returns "183" followed by
> >> "503"?
> >> 
> >> <action application="set" data="bypass_media=true"/>
> >> <action application="bridge"
> >> data="sofia/gateway/gw_1/${destination_number}|sofia/gateway/gw_2/${desti
> >> nat ion_number}"/>
> >> 
> >> 
> >> Many thanks,
> >> -Victor
> >> 
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> 
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