Hi Joel, and thank you for your response.

Actually, I use one IP but two different ports. I have not yet figured out why some Providers need two listening ports but other need one. As I mentioned, the ones that need one port will only have one way Media if two ports are used. This is extremely Strang!

Yes, I am trying to use RTPEngine but have not been successful. I have earlier posts (this week) which explains the problems I am having with RTPEngine.

Thanks again!, -Steve

-----Original Message----- From: sr-users sr-users-bounces@lists.kamailio.org On Behalf Of Joel Serrano Sent: Friday, August 24, 2018 7:04 PM To: Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org Subject: Re: [SR-Users] Listner problems

Hi Steve,

Actually, I have a strange issue. If I have a single UDP IP:Port listening, most Providers/Phones have two-way Audio/Video, however, with some Providers/Phones, I need to have two UDP IP:Port listners in order to get two-way Audio/Video. Here is the strange thing. If I enable two, the Providers/Phones that worked when I had a single listener only have one-way Audi/Video.

Can you give a little more details on why you need 2 IPs for some providers/phones?

I use Kamailio 5.1 and Asterisk 15.3 (pjsip). This behavior is so strange,

Are you proxying RTP through Kamailio (rtpengine/rtpproxy) or is it going directly from the carrier<->asterisk?

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