Couldn't negotiate stream + audio:sendrecv

Asterisk Asterisk SIP
1

I am getting the below error:
Couldn't negotiate stream 0:audio-0:audio:sendrecv (nothing)
Can someone help me to resolve this

here is the logs

[2020-12-02 16:45:23] ERROR[32384]: res_pjsip_session.c:934 handle_incoming_sdp:  101: Couldn't negotiate stream 0:audio-0:audio:sendrecv (nothing)
<--- Transmitting SIP response (371 bytes) to WSS:45.126.171.190:60029 --->
SIP/2.0 488 Not Acceptable Here
Via: SIP/2.0/WSS 9p5m6df5f0qk.invalid;rport=60029;received=45.126.171.190;branch=z9hG4bK2700983
Call-ID: h0h2a2je2oi5n7qv184j
From: "101" <sip:777@DOMAIN.com>;tag=vqs1lqfqmt
To: <sip:+123456789@DOMAIN.com>;tag=47478f71-cb8b-4ae2-8bf5-e551fbf3f3fc
CSeq: 252 INVITE
Server: Asterisk PBX 16.15.0
Content-Length:  0
2

You would need to provide the complete SIP trace and configuration. If using WebRTC, then this will occur if you have not configured the endpoint for WebRTC.

3

Hey, Thanks for the quick response.

Yes, I am using WebRTC thank you for correcting in my configuration.

Earlier the configuration looks like this:

[101]
type=endpoint
transport=udp-transport
context=twilio-out
disallow=all
allow=alaw
allow=ulaw
auth=101
aors=101

After I made the changes it look like this, but now it doesnt find the “context=twilio-out”

[101]
type=endpoint

use_avpf=yes
media_encryption=dtls
dtls_ca_file=/etc/asterisk/keys/ca.crt
dtls_cert_file=/etc/asterisk/keys/asterisk.pem
dtls_verify=fingerprint
dtls_setup=actpass
ice_support=yes
media_use_received_transport=yes
rtcp_mux=yes

transport=udp-transport
context=twilio-out
disallow=all
allow=alaw
allow=ulaw
auth=101
aors=101
4

You’d need to specify what “it doesn’t find the context=twilio-out” actually means. What happens? What do you see?

1 Like
5

on the console it shows

res_pjsip_outbound_authenticator_digest.c:178 digest_create_request_with_auth: Endpoint: 'twilio': Unable to create request with auth. No auth credentials for realm(s) 'sip.twilio.com' in challenge.
  == Everyone is busy/congested at this time (1:0/0/1)
6

That means an outgoing call was placed using the endpoint named “twilio”. Twilio challenged for authentication credentials, but you don’t have any configured so Asterisk could not authenticate.

1 Like
7

Okay…

This is how my dialer looks, do I have to add something on pjsip.conf file for this?

[twilio-out]
exten => _+91X,1,Dial(PJSIP/${EXTEN})
exten => _+91X.,1,Set(CALLERID(num)=+123456789)
same => n,Dial(PJSIP/${EXTEN}@twilio)
8

If Twilio requires you to authenticate your outbound calls, then you would need to configure outbound authentication in pjsip.conf for the twilio endpoint[1].

[1] https://wiki.asterisk.org/wiki/display/AST/res_pjsip+Configuration+Examples

1 Like
9

Hey,
Thanks for the example.

Now I have added this configuration based on the given example link, but the error is still the same:

[twilio]
type=registration
outbound_auth=twilio
server_uri=sip:SUBDOMAIN.pstn.twilio.com
client_uri=sip:+123456789@SUBDOMAIN.pstn.twilio.com
retry_interval=60
 
[twilio]
type=auth
auth_type=userpass
password=ABCD123456789
username=USERNAME
10

That is for outbound registration. The “type=endpoint” defines the configuration to use for calls. If that doesn’t have an outbound_auth specified, then there would be no authentication credentials.

1 Like
11

Hi,

I dont know what wrong I am doing, can you help me to understand from my configuration

[wss-transport]
type=transport
protocol=wss
bind=0.0.0.0

[udp-transport]
type=transport
protocol=udp
bind=0.0.0.0


[tls-transport]
type=transport
protocol=tls
bind=0.0.0.0
cert_file=/etc/asterisk/keys/sip.DOMAIN.com.crt
priv_key_file=/etc/asterisk/keys/sip.DOMAIN.com.key

; =========== ;


[twilio]
type=aor
contact=sip:+123456789@SUBDOMAIN.pstn.twilio.com


[twilio]
type=registration
outbound_auth=twilio
server_uri=sip:SUBDOMAIN.pstn.twilio.com
client_uri=sip:+123456789@SUBDOMAIN.pstn.twilio.com
retry_interval=60

[twilio]
type=auth
auth_type=userpass
password=PASSWORD
username=ABCD123456789


[twilio]
type=endpoint
transport=udp-transport
context=twilio-in
disallow=all
allow=alaw
allow=ulaw
aors=twilio
from_domain=SUBDOMAIN.pstn.twilio.com
direct_media=no

[twilio]
type=identify
endpoint=twilio
match=SUBDOMAIN.pstn.twilio.com
match=sip.twilio.com


[101]
type=endpoint
outbound_auth=twilio

use_avpf=yes
media_encryption=dtls
dtls_cert_file=/etc/asterisk/keys/sip.DOMAIN.com.pem
dtls_private_key=/etc/asterisk/keys/sip.DOMAIN.com.key
dtls_ca_file=/etc/asterisk/keys/sip.DOMAIN.com.crt
dtls_verify=fingerprint
dtls_setup=actpass
ice_support=yes
media_use_received_transport=yes
rtcp_mux=yes

transport=udp-transport
context=twilio-out
disallow=all
allow=alaw
allow=ulaw
auth=101
aors=101

[101]
type=auth
auth_type=userpass
password=101
username=101

[101]
type=aor
max_contacts=10
12

The following endpoint:

[twilio]
type=endpoint
transport=udp-transport
context=twilio-in
disallow=all
allow=alaw
allow=ulaw
aors=twilio
from_domain=SUBDOMAIN.pstn.twilio.com
direct_media=no

Does not have:

outbound_auth=twilio

Without it, any outgoing calls placed using it will not know how to authenticate.

2 Likes
13

Hey,
Thanks for pointing it out.
I have added this on the wrong place.

Thanks a ton :slight_smile:
You really helped me a lot.

14

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