# Asterisk external media , I am receiving audio from rtp server but cannot send audio to it

**URL:** <https://community.asterisk.org/t/asterisk-external-media-i-am-receiving-audio-from-rtp-server-but-cannot-send-audio-to-it/107470>\
**Category:** Asterisk APIs\
**Created:** [March 18, 2025, 12:38pm UTC](https://community.asterisk.org/t/asterisk-external-media-i-am-receiving-audio-from-rtp-server-but-cannot-send-audio-to-it/107470 "2025-03-18T12:38:03Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![fabrod\_farhangfar](https://avatars.discourse-cdn.com/v4/letter/f/e274bd/32.png) [@fabrod\_farhangfar](https://community.asterisk.org/u/fabrod_farhangfar)\
**Post date:** [March 18, 2025, 12:38pm UTC](https://community.asterisk.org/t/asterisk-external-media-i-am-receiving-audio-from-rtp-server-but-cannot-send-audio-to-it/107470/1 "2025-03-18T12:38:03Z")

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I am using Stasis app,  
I am listening to ARI event and if event is “StasisStart” , I take it’s channel  
I create bridge ,  
add snoop channel , call channel , external media channel to it  
this snoop ( spy: out , whisper: none )

when listing to external media channel socket , the incoming voices are fine

but when sending a new voice to rtp to same address and port the voice is a buzz sound (only buzz sound)  
I am trying to have a right rtp packet and sending 160 byte every 0.02 second

what could be the problem ??

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**Author:** ![jcolp](https://sea1.discourse-cdn.com/asterisk/user_avatar/community.asterisk.org/jcolp/32/8848_2.png) [@jcolp](https://community.asterisk.org/u/jcolp)\
**Post date:** [March 18, 2025, 12:38pm UTC](https://community.asterisk.org/t/asterisk-external-media-i-am-receiving-audio-from-rtp-server-but-cannot-send-audio-to-it/107470/2 "2025-03-18T12:38:48Z")

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Do a packet capture, and listen to it in Wireshark. If it’s wrong there, then the problem is your generation of it.

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**Author:** ![system](https://global.discourse-cdn.com/asterisk/original/2X/4/475d0c889911cfb84ac4881ad6df8b523e3f9105.png) [@system](https://community.asterisk.org/u/system)\
**Post date:** [April 17, 2025, 12:39pm UTC](https://community.asterisk.org/t/asterisk-external-media-i-am-receiving-audio-from-rtp-server-but-cannot-send-audio-to-it/107470/3 "2025-04-17T12:39:05Z")

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Closed on April 17, 2025, 12:39pm UTC

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