[asterisk-users] [External] 180 Ringing missing

[marek]

Dne 01/12/2020 v 19:18 Alex Hermann napsal(a):
> On dinsdag 1 december 2020 13:22:17 CET Floimair Florian wrote:
>> If you have 183 Session progress, there is no need to send 180 Ringing
>> (especially not AFTER 183 Session progress), as you already have
>> early media instead. Having both is actually a bit misleading IMHO.
> I disagree (and I think rfc3261 agrees).  How would the caller know if
> the callee has been alerted if he doesn't receive the 180?
>
> 183 and 180 have different meaning. 180 indicates the callee is being
> alerted. An 183 has no such meaning but is often used to setup early
> media (although any 1xx can do that). 180 and 183 are not mutually
> exclusive and in fact form a full matrix of possible and useful states.
> There can be early media without any phone ringing (announcement),
> ringing without early media (caller is expected to generate a ringback
> tone itself), no early media nor ringing and finally early media and
> ringing simultaneous.
>
> Especially automata calling will want to know the difference.
>
> Of course, a generated ringback tone by the caller should be stopped
> when media is received.
>
> Asterisk should indicate to the caller the same state it received from
> the callee.

for the record

tried PJSIP only configuration and its the same. no 180 ringing

(2.2.2.2 is PBX, 1.1.1.1 is Asterisk13+PJSIP connected to PSTN through 
SIP SBC)

   1 2020-12-18 17:12:28.656569 2.2.2.2 -> 1.1.1.1 SIP/SDP 976 Request: 
INVITE sip:222333444 at 1.1.1.1:5080 | , with session description
   2 2020-12-18 17:12:28.657113 1.1.1.1 -> 2.2.2.2 SIP 393 Status: 100 
Trying |
   3 2020-12-18 17:12:30.102754 1.1.1.1 -> 2.2.2.2 SIP/SDP 863 Status: 
183 Session Progress | , with session description
   4 2020-12-18 17:12:30.102828 1.1.1.1 -> 2.2.2.2 SIP/SDP 863 Status: 
183 Session Progress | , with session description
   5 2020-12-18 17:12:30.125256 1.1.1.1 -> 2.2.2.2 SIP/SDP 863 Status: 
183 Session Progress | , with session description
   6 2020-12-18 17:12:30.125385 1.1.1.1 -> 2.2.2.2 SIP/SDP 863 Status: 
183 Session Progress | , with session description
   7 2020-12-18 17:12:30.395564 1.1.1.1 -> 2.2.2.2 SIP/SDP 863 Status: 
183 Session Progress | , with session description
   8 2020-12-18 17:12:35.765423 1.1.1.1 -> 2.2.2.2 SIP/SDP 897 Status: 
200 OK | , with session description
   9 2020-12-18 17:12:35.767759 2.2.2.2 -> 1.1.1.1 SIP 480 Request: ACK 
sip:1.1.1.1:5080 |
  10 2020-12-18 17:12:37.891798 1.1.1.1 -> 2.2.2.2 SIP 506 Request: BYE 
sip:777888999 at 2.2.2.2:5060 |
  11 2020-12-18 17:12:37.894507 2.2.2.2 -> 1.1.1.1 SIP 566 Status: 200 OK |

interesting note: on SIP SBC side i see 180 Ringing from Telco Operator

i'll try find if there is some recommendation - 
https://www.sipforum.org/technology/sipconnect/

Marek