[OpenSIPS-Users] intermittent one-way audio

[SamyGo]

Hi,
Can you track the call with one-way audio. That could be a big deal if
there are alot of servers in your asterisk farm. If you can trace which
asterisk server it happens and verify its sip settings "externip" - also
"rtp set debug on" for a brief time interval can tell you the story.
Yes router can be an issue where Inbound network traffic is ACL restricted
and outbound traffic from server is almost never ACL-ed - so that can be
one case.
Up till here I'm assuming that SDPs are all well negotiated between phones
and servers.

Now,

>  The phones work properly without audio issues for 10-15 minutes, then one
> way-audio happens


Do you see any re-INVITES exchanging between the phones and maybe both the
A & B parties trying to directly communicate with each other !!?
Do you've any CISCO PIX/ASAthingie in your network ? Maybe it
times-out/expires the connection stream due to inactivity !?

These are few things I could think of troubleshooting such an issue. Maybe
some other hints or details from you can help focus in one particular area.

Regards,
Sammy

On Thu, Mar 29, 2012 at 5:23 AM, Matt Hamilton <mistral9999 at hotmail.com>wrote:

>  We are using Opensips as a load balancer/dispatcher for Asterisk servers.
> All these servers are in a DMZ and have public IPs. SIP traffic goes thru
> Opensips, but RTP is between Asterisk servers and UACs.
>
> All the UACs are behind NAT, and there are two kinds based on nat_uac_test
> (in our case set to 18):
>
> 1. The ones for which flag 2 (the "received" test) applies (address in Via
> is compared against source IP address of signaling). These are mostly
> behind firewalls, and source and via ports are the same - 5060.
>
> 2. The ones for which flag 16 applies (if the source port is different
> from the port in Via). These phones are directly connected to a Cisco
> router thru a switch.
>
>
> We are having intermittent one-way audio problems for the clients in 2 in
> an environment where a client puts a call on hold and the other one picks
> up. The phones work properly without audio issues for 10-15 minutes, then
> one way-audio happens. We can't find anything out of the ordinary in the
> SDP fields; all the IPs seem to be correct.
>
> BTW, phones in 1 above work fine (all the time), and all the phones are
> exactly the same (for both 1 and 2 - same brand, firmware, configuration).
>
> Has anyone experienced such intermittent one-way audio issues? Can the
> router cause this somehow (which is configured by our provider)?
>
> Thanks a lot,
> Matt
>
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