RTP communication occurs but call drops due to "lack of rtp activity in 33 seconds"

Hello,

I call between two endpoints, 23 (IP: 192.168.200.210) & 24 (IP: 192.168.200.220), and RTP messages appear to be sent between the two endpoints. However the call drops afterwards with the message Disconnecting channel 'PJSIP/23-0000005a' for lack of audio RTP activity in 33 seconds. I am attaching the information attained using pjsip set logger on rtp set debug on

Got  RTP packet from    192.168.200.220:4024 (type 00, seq 004814, ts 238240, len 000160)                               
Got  RTP packet from    192.168.200.220:4024 (type 00, seq 004815, ts 238400, len 000160)                               
Got  RTP packet from    192.168.200.220:4024 (type 00, seq 004816, ts 238560, len 000160)                               
Sent RTP packet to      192.168.200.210:4000 (type 00, seq 030402, ts 238240, len 000160)                               
Sent RTP packet to      192.168.200.210:4000 (type 00, seq 030403, ts 238400, len 000160)                               
Sent RTP packet to      192.168.200.210:4000 (type 00, seq 030404, ts 238560, len 000160)                               
Got  RTP packet from    192.168.200.220:4024 (type 00, seq 004817, ts 238720, len 000160)                               
Got  RTP packet from    192.168.200.220:4024 (type 00, seq 004818, ts 238880, len 000160)                               
Got  RTP packet from    192.168.200.220:4024 (type 00, seq 004819, ts 239040, len 000160)                               
Sent RTP packet to      192.168.200.210:4000 (type 00, seq 030405, ts 238720, len 000160)                               
Sent RTP packet to      192.168.200.210:4000 (type 00, seq 030406, ts 238880, len 000160)                               
Sent RTP packet to      192.168.200.210:4000 (type 00, seq 030407, ts 239040, len 000160)                               
Got  RTP packet from    192.168.200.220:4024 (type 00, seq 004820, ts 239200, len 000160)                               
Got  RTP packet from    192.168.200.220:4024 (type 00, seq 004821, ts 239360, len 000160)                               
Got  RTP packet from    192.168.200.220:4024 (type 00, seq 004822, ts 239520, len 000160)                               
Sent RTP packet to      192.168.200.210:4000 (type 00, seq 030408, ts 239200, len 000160)                               
Sent RTP packet to      192.168.200.210:4000 (type 00, seq 030409, ts 239360, len 000160)                               
Sent RTP packet to      192.168.200.210:4000 (type 00, seq 030410, ts 239520, len 000160)                               
[2022-08-23 22:17:13] NOTICE[1192]: res_pjsip_sdp_rtp.c:148 rtp_check_timeout: Disconnecting 
channel 'PJSIP/23-0000005a' for lack of audio RTP activity in 33 seconds                                                                               
-- Channel PJSIP/23-0000005a left 'simple_bridge' basic-bridge <4bfc7d83-381d-4b2d-9fba-
5262d5131055>                   
-- Channel PJSIP/24-0000005b left 'simple_bridge' basic-bridge 
<4bfc7d83-381d-4b2d-9fba-5262d5131055>                 
== Spawn extension (macro-dial-one, s, 55) 
exited non-zero on 'PJSIP/23-0000005a' in macro 'dial-one'                   
== Spawn extension (macro-
exten-vm, s, 14) exited non-zero on 'PJSIP/23-0000005a' in macro 'exten-vm'                 
<--- Transmitting SIP request (456 bytes) to UDP:192.168.200.220:5060 --->                                              
BYE sip:[email protected]:5060;ob SIP/2.0                                                                              
Via: SIP/2.0/UDP 192.168.200.200:5060;rport;branch=z9hG4bKPjffd17bc0-f574-4e73-aa78-23feb6bc929f                        
From: "23" <sip:[email protected]>;tag=ad36e13e-bc74-4a55-9bd8-0447d86a56f2                                            
To: <sip:[email protected];ob>;tag=RU45kib3Ls90mB34gZg3t0m5iXi4exO3                                                    
Call-ID: 287f6d32-32fe-4788-93e8-e2a73447f39f                                                                           
CSeq: 11286 BYE                                                                                                         
Reason: Q.850;cause=44                                                                                                  
Max-Forwards: 70                                                                                                        
User-Agent: FPBX-15.0.16.75(16.13.0)                    

I can’t attach the whole log due to chachter limit. So, I thought to paste the last part only.

Any help is highly appreciated.

Asterisk is receiving media from 192.168.200.220 and is sending it to 192.168.200.210. In the provided log there is no RTP being received from 192.168.200.210 - which as you’ve stated would be 23, and thus it would be disconnected due to lack of RTP.

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