Cisco 2821 CME no audio in sip trunk calls

I am a Cisco expert with an experience up to 12 years as a senior network engineer in an enterprise level campus as a full-time senior network engineer, and in afternoon as a part-time Cisco instructor, which make from me have both the knowledge and experience to help you ,moreover I have a master degree in communication and electronics engineering so if you need a help then you may drop me a message, thanks

Hi, I am Cisco voice certified engineer with valid CCNP voice and CCNP R&S certifications, During my work at Cisco Gold partner at Lebanon I have installed too many Networks and Voice systems with integration with many other systems. Please don't hesitate to contact me for any further information Best Regards, Abdullah Darwish.

i did many voip projects , cucm , pbx ,,cme

I have 6 plus years experience in Cisco communication products. I can work for this one way audio issue and fix towards resolution. . Thanks.

there are loads of reasons you would have no audio with the top three being NAT, Firewall and third codecs. I would like the chance to discuss this with you and understand your setup to better understand why the problem with audio.

I am a Cisco Collaboration Specialist for enterprise and I work in a ITSP. I know about both worlds.

I can solve this issue i was face same problem but need to explain more details about this issue i certified Cisco voice "CCVP"