UK-RBT Playing in the background when applying Supplementary Services

dnldnz · December 5, 2019, 11:08am

Hi all,

I’m helping a customer set up his VoIP services using our OpenWRT solution with Asterisk in it, and one of the major problems we’re facing at the moment is that, during the application of IMS Supplementary Services, announcements and early-media RBTs/Announcements can be heard with UK-RBT playing in the background.

A few examples:
ICB-UC/DND (Incoming-Call-Barring-User-Controlled/Do-Not-Disturb) Activation *261#, Interrogation *#261# & Deactivation #261# work - SSCs announcements are correctly returned, but with UK-RBT playing in the background.

ACR/CWB (Anonymous-Call-Rejection/Call-Withheld-Barring) Activation *227#, Interrogation *#227# & Deactivation #227# work - SSCs announcements are correctly returned, but with UK-RBT playing in the background

And so on. Is there any setting that has to be configured in order to remove this behaviour? Is stopping the RBT from playing something we have to clearly specify somewhere in the config files?

Thanks a lot for your help!

david551 · December 5, 2019, 12:11pm

Please provide the dialplan that implements these, as they are not built into Asterisk. If that dialplan is part of a GUI, please use the support channels for the GUI.

david551 · December 5, 2019, 12:59pm

Those are not Asterisk settings!

dnldnz · December 5, 2019, 4:46pm

The settings in indications.conf are as follows:

[uk]
description = United Kingdom
ringcadence = 400,200,400,2000
; These are the official tones taken from BT SIN350. The actual tones
; used by BT include some volume differences so sound slightly different
; from Asterisk-generated ones.
dial = 350+440
; Special dial is the intermittent dial tone heard when, for example,
; you have a divert active on the line
specialdial = 350+440/750,440/750
; Busy is also called “Engaged”
busy = 400/375,0/375
; “Congestion” is the Beep-bip engaged tone
congestion = 400/400,0/350,400/225,0/525
; “Special Congestion” is not used by BT very often if at all
specialcongestion = 400/200,1004/300
unobtainable = 400
ring = 400+450/400,0/200,400+450/400,0/2000
callwaiting = 400/100,0/4000
; BT seem to use “Special Call Waiting” rather than just “Call Waiting” tones
specialcallwaiting = 400/250,0/250,400/250,0/250,400/250,0/5000
; “Pips” used by BT on payphones. (Sounds wrong, but this is what BT claim it
; is and I’ve not used a payphone for years)
creditexpired = 400/125,0/125
; These two are used to confirm/reject service requests on exchanges that
; don’t do voice announcements.
confirm = 1400
switching = 400/200,0/400,400/2000,0/400
; This is the three rising tones Doo-dah-dee “Special Information Tone”,
; usually followed by the BT woman saying an appropriate message.
info = 950/330,0/15,1400/330,0/15,1800/330,0/1000
; Not listed in SIN350
record = 1400/500,0/60000
stutter = 350+440/750,440/750

david551 · December 5, 2019, 9:53pm

Still waiting for the Asterisk dialplan…

dnldnz · December 6, 2019, 9:36am

And I got it wrong yet again… in any case, now you have almost everything!

Here the contents of my extensions.conf settings

#include extensions_extra.conf
#include extensions_macro.conf

[default]
; no calls should normally end up here
exten => _X!,1,Answer()
exten => _X!,2,Playback(tt-monkeys)
exten => _X!,3,Hangup()

[incoming_calls]
; Handle incoming calls from SIP accounts

; Custom dialplan hook
exten => _[+0-9a-zA-Z].,1,	NoOp()

; Store caller id
exten => _[+0-9a-zA-Z].,n,	Set(DB(LASTCALLER/${CHANNEL(peername)})=${CALLERID(NUM)})

; Handle call - Goto(call_line,${EXTEN},1) or Macro(callhandler,${CHANNEL(peername)})
exten => _[+0-9a-zA-Z].,n,	Macro(callhandler,${CHANNEL(peername)})
exten => _[+0-9a-zA-Z].,n,	Hangup()

[cbbs]
; Receive calls after Callback - play something to caller
; Don't run callhandler macro, we have already done that once for this call
exten => s,1,           Playback(queue-thankyou)
exten => s,n,           Dial(${TAPILINE},,F(hangup,h,2))
exten => s,n,		Hangup()

[hangup]
; Local lines end up here after other party hangs up.
; Play some tone to indicate that call has ended.
exten => h,1,		Hangup()
exten => h,2,		Playback(beep)
exten => h,3,		Hangup()

[clir]
;exten => _|CLIR|.,1,      Set(CALLERID(num-pres)=prohib_not_screened)
;exten => _|CLIR|.,n,      Set(CALLERID(name-pres)=prohib_not_screened)
;exten => _|CLIR|.,n,      Goto(${EXTEN:|CLIR_FAC_LEN|},1)

;
; Contexts for SIP Provider
;
[sip0]
; Main context, handles all normal calls for this Provider
include => clir
include => local_extensions
include => sip0-callforwarding
include => sip0-callwaiting
include => sip0-direct
include => sip0-outgoing

[sip0-transfer]
; Context used for call transfer for this Provider
include => local_extensions
include => sip0-transfer-remote

[sip0-transfer-remote]
; Context used for call transfer to remote extension for this Provider
exten => _X.,1,		Transfer(SIP/${EXTEN}@sip0,,)

[sip0-outgoing]
; Context used for normal outgoing calls
exten => _[*#0-9].,1,	Set(DIAL_EXTEN=${EXTEN})
exten => _[*#0-9].,n,	Set(CALLERID(ANI)=W2119220021-1)
exten => _[*#0-9].,n,	Set(CALLERID(number)=W2119220021-1)
exten => _[*#0-9].,n,	NoOp()
exten => _[*#0-9].,n,   Macro(call_filter0-outgoing)
exten => _[*#0-9].,n,	Set(DB(LASTCALL/sip0)=${DIAL_EXTEN})
exten => _[*#0-9].,n,	Set(CALLERID(name)=W2119220021-1)
exten => _[*#0-9].,n,	Set(__TRANSFER_CONTEXT=sip0-transfer)
exten => _[*#0-9].,n,	Dial(SIP/${DIAL_EXTEN}@sip0,,gT)
exten => _[*#0-9].,n,	Macro(endcall,SIP,sip0,${DIAL_EXTEN},${CHANNEL(name)},,,,,congestion)
exten => _[*#0-9].,n,	Goto(hangup,h,2)
exten => _[*#0-9].,n,	Hangup()

[sip0-callforwarding]
exten => cfimoff,1,	Macro(delete_cfim,sip0)
exten => cfbsoff,1,	Macro(delete_cfbs,sip0)
exten => callreturn,1,	Macro(call_return,sip0)
exten => redial,1,	Macro(redial,sip0)

[sip0-callwaiting]
exten => cwoff,1, Macro(delete_cw,sip0)
exten => cwon,1, Macro(create_cw,sip0)
exten => cwstatus,1, Macro(status_cw,sip0)

[sip0-direct]
; extensions that will be dialled immediately when they are matched
; useful for fixed length number series
exten => _cfimon,1,	Macro(create_cfim,sip0)
exten => _cfbson,1,	Macro(create_cfbs,sip0)
exten => _[*#]XX#!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _*#XX#!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _[*#]XXX#!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _*#XXX#!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _[256]XXXXXXX!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141[256]XXXXXXX!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _1470[256]XXXXXXX!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _119!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _100!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _112!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _150!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _155!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _190!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _199!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _999!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _147[14]!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _116000!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _116006!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _116111!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _116117!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _116123!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141119!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141100!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141112!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141150!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141155!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141190!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141199!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141999!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141116000!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141116006!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141116111!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141116117!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141116123!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _8[0-79]XX!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _1418[0-79]XX!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _14708[0-79]XX!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _118XX!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141123!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141151!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141192!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141193!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141194!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141195!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _141118XX!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _1470123!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _1470151!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _1470192!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _1470193!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _1470194!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _1470195!,1,Goto(sip0-outgoing,${EXTEN},1)
exten => _1470118XX!,1,Goto(sip0-outgoing,${EXTEN},1)

;
; Contexts for SIP Provider
;
[sip1]
; Main context, handles all normal calls for this Provider
include => clir
include => local_extensions
include => sip1-callforwarding
include => sip1-callwaiting
include => sip1-direct
include => sip1-outgoing

[sip1-transfer]
; Context used for call transfer for this Provider
include => local_extensions
include => sip1-transfer-remote

[sip1-transfer-remote]
; Context used for call transfer to remote extension for this Provider
exten => _X.,1,		Transfer(SIP/${EXTEN}@sip1,,)

[sip1-outgoing]
; Context used for normal outgoing calls
exten => _[*#0-9].,1,	Set(DIAL_EXTEN=${EXTEN})
exten => _[*#0-9].,n,	Set(CALLERID(ANI)=W2119220021-2)
exten => _[*#0-9].,n,	Set(CALLERID(number)=W2119220021-2)
exten => _[*#0-9].,n,	NoOp()
exten => _[*#0-9].,n,   Macro(call_filter0-outgoing)
exten => _[*#0-9].,n,	Set(DB(LASTCALL/sip1)=${DIAL_EXTEN})
exten => _[*#0-9].,n,	Set(CALLERID(name)=W2119220021-2)
exten => _[*#0-9].,n,	Set(__TRANSFER_CONTEXT=sip1-transfer)
exten => _[*#0-9].,n,	Dial(SIP/${DIAL_EXTEN}@sip1,,gT)
exten => _[*#0-9].,n,	Macro(endcall,SIP,sip1,${DIAL_EXTEN},${CHANNEL(name)},,,,,congestion)
exten => _[*#0-9].,n,	Goto(hangup,h,2)
exten => _[*#0-9].,n,	Hangup()

[sip1-callforwarding]
exten => cfimoff,1,	Macro(delete_cfim,sip1)
exten => cfbsoff,1,	Macro(delete_cfbs,sip1)
exten => callreturn,1,	Macro(call_return,sip1)
exten => redial,1,	Macro(redial,sip1)

[sip1-callwaiting]
exten => cwoff,1, Macro(delete_cw,sip1)
exten => cwon,1, Macro(create_cw,sip1)
exten => cwstatus,1, Macro(status_cw,sip1)

[sip1-direct]
; extensions that will be dialled immediately when they are matched
; useful for fixed length number series
exten => _cfimon,1,	Macro(create_cfim,sip1)
exten => _cfbson,1,	Macro(create_cfbs,sip1)
exten => _[*#]XX#!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _*#XX#!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _[*#]XXX#!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _*#XXX#!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _[256]XXXXXXX!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141[256]XXXXXXX!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _1470[256]XXXXXXX!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _119!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _100!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _112!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _150!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _155!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _190!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _199!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _999!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _147[14]!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _116000!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _116006!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _116111!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _116117!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _116123!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141119!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141100!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141112!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141150!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141155!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141190!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141199!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141999!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141116000!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141116006!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141116111!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141116117!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141116123!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _8[0-79]XX!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _1418[0-79]XX!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _14708[0-79]XX!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _118XX!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141123!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141151!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141192!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141193!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141194!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141195!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _141118XX!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _1470123!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _1470151!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _1470192!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _1470193!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _1470194!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _1470195!,1,Goto(sip1-outgoing,${EXTEN},1)
exten => _1470118XX!,1,Goto(sip1-outgoing,${EXTEN},1)

[macro-check-foreign]
exten => s,1,NoOp()
exten => s,n,GotoIf($["${ARG1}":"((00)[0-9]+)">0]?international:not-foreign)
exten => s,n(international),GotoIf($["${ARG1}":"((00)(44)[0-9]+)">0]?not-foreign)
exten => s,n,Set(FOREIGN=1)
exten => s,n,MacroExit()
exten => s,n(not-foreign),Set(FOREIGN=0)

[macro-check-special-rate]
exten => s,1,NoOp(0[8,9]xx+)
exten => s,n,GotoIf($["${ARG1}":"(^(0[8|9][0-9][0-9]+)$)">0]?special-rate:normal-rate)
exten => s,n(special-rate),Set(SPECRATE=1)
exten => s,n,MacroExit()
exten => s,n(normal-rate),Set(SPECRATE=0)

[macro-call_filter0-incoming]
exten => s,1,NoOp()
exten => s,n,MacroExit()

[macro-call_filter0-outgoing]
exten => s,1,NoOp()
exten => s,n,MacroExit()

[call_line]
; Incoming calls will end up in this context when a local line should be dialled
exten => W2119220021-1,1,Macro(call_filter0-incoming)
exten => W2119220021-1,n,Set(__TRANSFER_CONTEXT=${CHANNEL(peername)}-transfer)
exten => W2119220021-1,n,GotoIf($["${CALLERID(NUM):0:1}" = "+"]?rewrite:norewrite)
exten => W2119220021-1,n(rewrite),Set(CALLERID(num)="00${CALLERID(num):1}"))
exten => W2119220021-1,n(norewrite),NoOp()
exten => W2119220021-1,n,GotoIf(${DB_EXISTS(CFBS/sip0)}?cfbs)
exten => W2119220021-1,n,Dial(TAPI\/1,,tF(hangup,h,2))
exten => W2119220021-1,n,Goto(W2119220021-1,nocfbs)
exten => W2119220021-1,n(cfbs),Dial(TAPI\/1,20,tF(hangup,h,2))
exten => W2119220021-1,n(nocfbs),NoOp()
exten => W2119220021-1,n,GotoIf($["${DIALSTATUS}"="ANSWER"]?endcall)
exten => W2119220021-1,n,GotoIf($["${DIALSTATUS}"="BUSY"]?noanswer)
exten => W2119220021-1,n,GotoIf($["${DIALSTATUS}"="NOANSWER"]?noanswer:endcall)
exten => W2119220021-1,n(noanswer),Macro(callhandler-noanswer,${CHANNEL(peername)})
exten => W2119220021-1,n(endcall),Hangup()
exten => W2119220021-2,1,Macro(call_filter0-incoming)
exten => W2119220021-2,n,Set(__TRANSFER_CONTEXT=${CHANNEL(peername)}-transfer)
exten => W2119220021-2,n,GotoIf($["${CALLERID(NUM):0:1}" = "+"]?rewrite:norewrite)
exten => W2119220021-2,n(rewrite),Set(CALLERID(num)="00${CALLERID(num):1}"))
exten => W2119220021-2,n(norewrite),NoOp()
exten => W2119220021-2,n,GotoIf(${DB_EXISTS(CFBS/sip1)}?cfbs)
exten => W2119220021-2,n,Dial(TAPI\/2,,tF(hangup,h,2))
exten => W2119220021-2,n,Goto(W2119220021-2,nocfbs)
exten => W2119220021-2,n(cfbs),Dial(TAPI\/2,20,tF(hangup,h,2))
exten => W2119220021-2,n(nocfbs),NoOp()
exten => W2119220021-2,n,GotoIf($["${DIALSTATUS}"="ANSWER"]?endcall)
exten => W2119220021-2,n,GotoIf($["${DIALSTATUS}"="BUSY"]?noanswer)
exten => W2119220021-2,n,GotoIf($["${DIALSTATUS}"="NOANSWER"]?noanswer:endcall)
exten => W2119220021-2,n(noanswer),Macro(callhandler-noanswer,${CHANNEL(peername)})
exten => W2119220021-2,n(endcall),Hangup()

[tapi_dialtone]
;Hints to set dialtone according to sip reg status
exten => tapi0,hint,SIP/sip0
exten => tapi1,hint,SIP/sip1

[local_extensions]
exten => #123456,1,Dial(TAPI/1&TAPI/2&TAPI/3&TAPI/4&TAPI/5&TAPI/6,,t)
exten => #123456,n,Hangup()
exten => #123457,1,Playback(tt-monkeys)
exten => #123457,n,Hangup()
exten => #123458,1,Echo()
exten => #123458,n,Hangup()
exten => #999999,1,Playback(beep)
exten => #999999,n,Record("/usr/lib/asterisk/recordings/user-recording${STRFTIME(${EPOCH},,%C%y%m%d-%T)}.gsm")
exten => #999999,n,Playback(auth-thankyou)
exten => #999999,n,Hangup()
exten => 0000,1,Dial(TAPI/1,,gF(hangup,h,2))
exten => 0000,n,GotoIf($["${DIALSTATUS}"="ANSWER"]?endcall)
exten => 0000,n,NoOp()
exten => 0000,n(endcall),Macro(endcall,TAPI,1,0000,${CHANNEL(name)},,,,,)
exten => 0000,n,Goto(hangup,h,2)
exten => 0000,n,Hangup()
exten => 1111,1,Dial(TAPI/2,,gF(hangup,h,2))
exten => 1111,n,GotoIf($["${DIALSTATUS}"="ANSWER"]?endcall)
exten => 1111,n,NoOp()
exten => 1111,n(endcall),Macro(endcall,TAPI,2,1111,${CHANNEL(name)},,,,,)
exten => 1111,n,Goto(hangup,h,2)
exten => 1111,n,Hangup()

david551 · December 6, 2019, 10:48am

Please markup your dialplan correctly, for the forum, using the </> button.

dnldnz · December 9, 2019, 11:27am

Hi David,

Any idea on what could be causing the RBT to play in the background of all the announcements?
I’d be happy to try any hint whatsoever.

Thanks in advance!

david551 · December 9, 2019, 11:43am

Mishandling of early media by the phone.

It’s present in the media from upstream.

I’d suggest capturing the RTP and playing it back with Wireshark.

dnldnz · December 9, 2019, 4:24pm

Hi David,

I’ve done as suggested. When *43# is dialled from the telephone, I can hear the correct announcement of CW activation played by the MTAS MRF but with the superimposed RBT played as well.

I’m not sure I understand correctly what you’re saying, the idea that the superimposed RBT owes to the telephone cannot be true, since it’s simply a POTS type device and unintelligent by design; the SIP client intelligence is held inside the Gateway, so I hoped it was due to a misconfiguration somewhere.

I also noted that the gateway does not include the user=phone parameter on the initial INVITE message. Could that have any effect here?

Thanks again!

david551 · December 9, 2019, 5:34pm

Substitute gateway for phone. In general whatever does the conversion from SIP to analogue.

I cannot see you doing anything that would cause Asterisk to send ring back tone over SIP, so I assume it is being mixed in either upstream or downstream.

dnldnz · December 16, 2019, 1:33pm

Hi David,

So here’s how the upstream RTP packets look like.
The blue bars are the Ring Back Tones, where the black waves are the announcements.

Are you able to tell me more about how the early-media should be handled by the gateway so as to prevent this superimposition? I get the clue there’s apparently nothing wrong with how asterisk is being configured, but it would help to get any hint on where I should start investigating in order to address the problem.

Thanks,

Daniel

system · January 15, 2020, 1:33pm

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