No Voice Between PJSIP Extensions registering to EC2 Based Asterisk Server

assem · February 18, 2019, 6:45pm

Hello,

I’ve installed Asterisk on CentOS 7 EC2 instance with elastic public IP. prepared PJSIP AORS,Auths, Endpoints using Realtime ODBC.

I have registered 2 phones from my home network. extensions 1000, 1001

Calling extension from the other, rings. However, I can’t hear voice!

I’ve even tried basic dial plan like this :

[from-internal]
exten => _1XXX,1,NoOp()
same => n,Answer()
same => n,SayAlpha(abc)

It logs playing “character” media files. but no luck hearing these also.

here is my pjsip.conf file contentes:

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

here is a sample data in pj_endpoints table:

id	transport	aors	auth	context	disallow	allow	direct_media
1000	transport-udp	1000	1000	from-internal	all	g722,ulaw,alaw	no

I’ve opened ports 5060(TCP+UDP),5061(TCP+UDP), and 10000-20000(UDP) to my home’s gateway Public IP in my EC2 instance’s Security group.

Thanks in advance for help!

jcolp · February 18, 2019, 6:53pm

You have to configure the transport with local_net and external_media_address and external_signaling_address so the IP address put into the SIP signaling is the public one, and not within your EC2 network.

assem · February 18, 2019, 7:18pm

That was my original PJSIP before going to the simpler above:

[transport-udp-nat]
type = transport
protocol = udp
bind = 0.0.0.0:5060
local_net = [private instance IP]/24
external_media_address = [public instance IP]
external_signaling_address = [public instance IP]
allow_reload = true

* The IP values within brackets above are the correct IPs in the actual config file.

However making calls fails and the CLI logs this :
ERROR[4791]: res_pjsip.c:3427 ast_sip_set_tpselector_from_transport_name: Unable to retrieve PJSIP transport ‘transport-udp’

jcolp · February 18, 2019, 7:18pm

Your transport is named “transport-udp-nat” and not “transport-udp” with the configuration you just provided.

assem · February 19, 2019, 3:55pm

fixed the transport section name:
when making test calls , I can here voice of “SayAlpha” application. but when the dialplan rings another extension and answer. still no voice can be heard between the two connected parties.

[transport-udp]
type=transport
protocol=udp
bind=0.0.0.0
external_media_address=xxx.xxx.xxx.xxx ;public ip of ec2 instance
external_signaling_address=xxx.xxx.xxx.xxx ;public ip of ec2 instance
local_net=yyy.yyy.yyy.yyy/32 ;private ip of ec2 instance
local_net=192.168.1.0/24 ;private ip of endpoints (My Local home address range)

this is my modified dialplan :

 [general]
static=yes


[from-internal]
exten => _1XXX,1,NoOp()
same => n,Answer()
same => n,SayAlpha(abc)
same => n,Dial(PJSIP/${EXTEN})

Here is the CLI Log from the time of making a call from Extension 1003 to 1001 (Both SoftPhones registered on remote Asterisk in my PC connected to my homes local Network) :

== Setting global variable 'SIPDOMAIN' to '[HERE IS MY EC2 INSTANCE PUBLIC IP]'
    -- Executing [1001@from-internal:1] NoOp("PJSIP/1003-00000000", "") in new stack
    -- Executing [1001@from-internal:2] Answer("PJSIP/1003-00000000", "") in new stack
       > 0x2c90c80 -- Strict RTP learning after remote address set to: 'HERE IS PUBLIC IP OF MY HOME GATEWAY':4002
       > 0x2c90c80 -- Strict RTP learning after remote address set to: 'HERE IS PUBLIC IP OF MY HOME GATEWAY':4002
    -- Executing [1001@from-internal:3] SayAlpha("PJSIP/1003-00000000", "abc") in new stack
    -- <PJSIP/1003-00000000> Playing 'letters/a.ulaw' (language 'en')
       > 0x2c90c80 -- Strict RTP switching to RTP target address 'HERE IS PUBLIC IP OF MY HOME GATEWAY':4002 as source
    -- <PJSIP/1003-00000000> Playing 'letters/b.ulaw' (language 'en')
    -- <PJSIP/1003-00000000> Playing 'letters/c.ulaw' (language 'en')
    -- Executing [1001@from-internal:4] Dial("PJSIP/1003-00000000", "PJSIP/1001") in new stack
    -- Called PJSIP/1001
    -- PJSIP/1001-00000001 is ringing
    -- PJSIP/1001-00000001 is ringing
       > 0x3fb5f00 -- Strict RTP learning after remote address set to: 'HERE IS PUBLIC IP OF MY HOME GATEWAY':40036
    -- PJSIP/1001-00000001 answered PJSIP/1003-00000000
    -- Channel PJSIP/1001-00000001 joined 'simple_bridge' basic-bridge <43f35ea3-5ae0-40d2-bff0-cd024b359106>
    -- Channel PJSIP/1003-00000000 joined 'simple_bridge' basic-bridge <43f35ea3-5ae0-40d2-bff0-cd024b359106>
       > Bridge 43f35ea3-5ae0-40d2-bff0-cd024b359106: switching from simple_bridge technology to native_rtp
       > Locally RTP bridged 'PJSIP/1003-00000000' and 'PJSIP/1001-00000001' in stack
       > 0x2c90c80 -- Strict RTP learning complete - Locking on source address 'HERE IS PUBLIC IP OF MY HOME GATEWAY':4002
    -- Channel PJSIP/1001-00000001 left 'native_rtp' basic-bridge <43f35ea3-5ae0-40d2-bff0-cd024b359106>
    -- Channel PJSIP/1003-00000000 left 'native_rtp' basic-bridge <43f35ea3-5ae0-40d2-bff0-cd024b359106>
  == Spawn extension (from-internal, 1001, 4) exited non-zero on 'PJSIP/1003-00000000'

jcolp · February 19, 2019, 3:56pm

Your endpoints are configured to attempt direct media, which may or may not work at times depending on the remote network. Set “direct_media” to “no” in the endpoints.

assem · February 19, 2019, 4:01pm

Thanks for the quick reply !

id	transport	aors	auth	context	disallow	allow	direct_media	connected_line_method
1001	transport-udp	1001	1001	from-internal	all	g722,ulaw,alaw	no
1003	transport-udp	1003	1003	from-internal	all	g722,ulaw,alaw	no

The direct_media is no

jcolp · February 19, 2019, 4:04pm

Then I would suggest looking at “rtp set debug on” to see if media is being received and sent between the two.

assem · February 19, 2019, 4:47pm

Thank you @jcolp for your time and help:

it worked after I registered another extension (1002) from my mobile phone, so each phone in the test has a different IP in home network.

As I said my previous test was using 2 different softphones (ext: 1001 and 1003) running on my PC.

So, it worked with the same configs above

hostname*CLI>
hostname*CLI>
  == Setting global variable 'SIPDOMAIN' to '[EC2 INSTANCE PUBLIC IP]'
    -- Executing [1001@from-internal:1] NoOp("PJSIP/1002-0000000c", "") in new stack
    -- Executing [1001@from-internal:2] Answer("PJSIP/1002-0000000c", "") in new stack
       > 0x7fbe7000c960 -- Strict RTP learning after remote address set to: '[HOME GW PUBLIC IP]':7076
    -- Executing [1001@from-internal:3] SayAlpha("PJSIP/1002-0000000c", "abc") in new stack
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018321, ts 000160, len 000160)
    -- <PJSIP/1002-0000000c> Playing 'letters/a.ulaw' (language 'en')
       > 0x7fbe7000c960 -- Strict RTP switching to RTP target address '[HOME GW PUBLIC IP]':7076 as source
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000004, ts 2800916457, len 000160)
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000005, ts 2800916617, len 000160)
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018322, ts 000320, len 000160)
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018323, ts 000480, len 000160)
.
.
.
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018351, ts 004918, len 000118)
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000035, ts 2800921417, len 000160)
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018352, ts 005078, len 000160)
    -- <PJSIP/1002-0000000c> Playing 'letters/b.ulaw' (language 'en')
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000036, ts 2800921577, len 000160)
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018353, ts 005238, len 000160)
.
.

Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000073, ts 2800927497, len 000160)
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018389, ts 010849, len 000011)
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018390, ts 011009, len 000160)
    -- <PJSIP/1002-0000000c> Playing 'letters/c.ulaw' (language 'en')
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000074, ts 2800927657, len 000160)
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018391, ts 011169, len 000160)
.
.
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000077, ts 2800928137, len 000160)
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018394, ts 011649, len 000160)
.
.
.
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018432, ts 017729, len 000160)
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000115, ts 2800934217, len 000160)
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018433, ts 017769, len 000040)
    -- Executing [1001@from-internal:4] Dial("PJSIP/1002-0000000c", "PJSIP/1001") in new stack
    -- Called PJSIP/1001
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000116, ts 2800934377, len 000160)
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000117, ts 2800934537, len 000160)
.
.
.
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000125, ts 2800935817, len 000160)
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000126, ts 2800935977, len 000160)
    -- PJSIP/1001-0000000d is ringing
    -- PJSIP/1001-0000000d is ringing
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000127, ts 2800936137, len 000160)
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018434, ts 019625, len 000160)
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000128, ts 2800936297, len 000160)
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018435, ts 019785, len 000160)
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000129, ts 2800936457, len 000160)
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018436, ts 019945, len 000160)
.
.
.
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000228, ts 2800952297, len 000160)
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018536, ts 035945, len 000160)
       > 0x7fbe7000c960 -- Strict RTP learning complete - Locking on source address '[HOME GW PUBLIC IP]':7076
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000229, ts 2800952457, len 000160)
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018537, ts 036105, len 000160)
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000230, ts 2800952617, len 000160)
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018538, ts 036265, len 000160)
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000231, ts 2800952777, len 000160)
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018539, ts 036425, len 000160)
.
.
.
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000311, ts 2800965577, len 000160)
Sent RTP packet to      '[HOME GW PUBLIC IP]':7076 (type 00, seq 018619, ts 049225, len 000160)
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000312, ts 2800965737, len 000160)
       > 0x7fbe7001bcb0 -- Strict RTP learning after remote address set to: '[HOME GW PUBLIC IP]':40018
    -- PJSIP/1001-0000000d answered PJSIP/1002-0000000c
    -- Channel PJSIP/1001-0000000d joined 'simple_bridge' basic-bridge <2fad04bc-93be-4c62-be20-b9631b5e95da>
    -- Channel PJSIP/1002-0000000c joined 'simple_bridge' basic-bridge <2fad04bc-93be-4c62-be20-b9631b5e95da>
       > Bridge 2fad04bc-93be-4c62-be20-b9631b5e95da: switching from simple_bridge technology to native_rtp
       > Locally RTP bridged 'PJSIP/1002-0000000c' and 'PJSIP/1001-0000000d' in stack
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000313, ts 2800965897, len 000160)
Sent RTP P2P packet to '[HOME GW PUBLIC IP]':40018 (type 00, len 000160)
.
.
.
Got  RTP packet from    '[HOME GW PUBLIC IP]':7076 (type 00, seq 000429, ts 2800984457, len 000160)
Sent RTP P2P packet to '[HOME GW PUBLIC IP]':40018 (type 00, len 000160)
    -- Channel PJSIP/1001-0000000d left 'native_rtp' basic-bridge <2fad04bc-93be-4c62-be20-b9631b5e95da>
    -- Channel PJSIP/1002-0000000c left 'native_rtp' basic-bridge <2fad04bc-93be-4c62-be20-b9631b5e95da>
  == Spawn extension (from-internal, 1001, 4) exited non-zero on 'PJSIP/1002-0000000c'
hostname*CLI>