Why my Hello World is muted?

*CLI> [Mar 19 22:02:30] WARNING[26295]: res_pjsip_pubsub.c:3353 pubsub_on_rx_publish_request: No registered publish handler for event presence from 6001
[Mar 19 22:02:30] WARNING[26295]: res_pjsip_pubsub.c:785 subscription_get_handler_from_rdata: No registered subscribe handler for event presence.winfo from 6001
    -- Executing [100@from-internal:1] Answer("PJSIP/6001-00000000", "") in new stack
       > 0x7f712401f2b0 -- Strict RTP learning after remote address set to: 122.178.114.164:56170
       > 0x7f712401f2b0 -- Strict RTP qualifying stream type: audio
       > 0x7f712401f2b0 -- Strict RTP switching source address to 10.0.2.15:8000
    -- Executing [100@from-internal:2] Wait("PJSIP/6001-00000000", "1") in new stack
[Mar 19 22:02:31] WARNING[26295]: res_pjsip_pubsub.c:3353 pubsub_on_rx_publish_request: No registered publish handler for event presence from 6001
[Mar 19 22:02:31] WARNING[26295]: res_pjsip_pubsub.c:785 subscription_get_handler_from_rdata: No registered subscribe handler for event presence.winfo from 6001
    -- Executing [100@from-internal:3] Playback("PJSIP/6001-00000000", "hello-world") in new stack
    -- <PJSIP/6001-00000000> Playing 'hello-world.slin' (language 'en')
    -- Executing [100@from-internal:4] Hangup("PJSIP/6001-00000000", "") in new stack
  == Spawn extension (from-internal, 100, 4) exited non-zero on 'PJSIP/6001-00000000'
[Mar 19 22:02:39] WARNING[26295]: res_pjsip_pubsub.c:3353 pubsub_on_rx_publish_request: No registered publish handler for event presence from 6001
[Mar 19 22:02:39] WARNING[26295]: res_pjsip_pubsub.c:785 subscription_get_handler_from_rdata: No registered subscribe handler for event presence.winfo from 6001

*CLI> 

Softphone:Zoiper3.3

How to make it audible? Please Help. Thank You.

Please describe your network topology, in particular NAT and firewalls.

Please attempt the call after issuing “pjsip set loggor on”.

Please issue “rtp set debug on” and check that the RTP is being sent to the correct address.

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