[asterisk-bugs] [JIRA] (ASTERISK-30047) Local IP address in SDP when external_media_address is used

[Niksa Baldun (JIRA)]

Niksa Baldun created ASTERISK-30047:
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             Summary: Local IP address in SDP when external_media_address is used
                 Key: ASTERISK-30047
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-30047
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Resources/res_pjsip
    Affects Versions: 18.11.2
         Environment: Debian 11.3 container
            Reporter: Niksa Baldun


I have a system with 3 network adapters, with following IPs:

192.168.43.2/24
10.55.66.30/30
10.42.42.2/24

Default GW is 10.42.42.1.

If I use the following PJSIP transport definition:

[transport-udp]
type=transport
protocol=udp
bind=0.0.0.0:5060
local_net=192.168.43.0/24
local_net=10.42.42.0/24
external_media_address=x.x.x.x
external_signaling_address=x.x.x.x

external IP is put in contact header, but SDP always contains the local address 10.42.42.2. So audio obviously does not work. The trunk registers to a public Internet address.

It works as expected if I split transports like so:

[transport-udp]
type=transport
protocol=udp
bind=192.168.43.2:5060

[transport-udp-1]
type=transport
protocol=udp
bind=10.55.66.30:5060

[transport-udp-external]
type=transport
protocol=udp
bind=10.42.42.2:5060
external_media_address=x.x.x.x
external_signaling_address=x.x.x.x




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