No voice for a few calls in asterisk

Asterisk Asterisk SIP
1

Hi Team,

I am facing an issue where the voice of the called person is not reaching the callee. This has happened for a few calls.What are the possible reasons for this?

I have checked the codecs being received, and it is ok and no problem with that. What are the other factors I can investigate regarding the matter.

2

Most common cause is misconfigured NAT, followed by misconfigured firewalls.

3

But if it was for firewall or NAT issues, won’t it reflect on all of the calls?

4

Not if you have spot rules for certain port numbers.

Generally, you need to provide logs showing the SDP handshake and whether or not Asterisk is receiving the media streams.

5

Hi David,

Asterisk is receiving the media streams as I am sniffing the packets received and there I can see that the media streams are being received, but the caller is unable to hear listen to them.

6

Is Asterisk seeing them, according to rtp debug, and does it thing it is sending them? Does the sniffing indicate it is actually sending them? Where are you doing the sniffing?

7

Yes, I can see rtp streams being sent over from asterisk to the service provider.We have a proxy server, between asterisk and service provider, and there we are sniffing the packets being received and sent.