One way audio on attended transfer

General Help
1

Hello,

my setup is the following:

Freepbx 15 wih Asterisk 16.21.1. One Sip trunk on Grandstream HT813(it has a pots line on it) and 3 Grandstream 2130 phones.

Everything works fine except from this:

All incoming calls are router to the one of the phones. So far so good. When this phone makes an attended transfer to the other phones, SOMETIMES, we have one way audio(the external speaker cannot hear the internal, but the internal can always hear the other side)

I’ve noticed that in traffic graph of the FreePBX the receive traffic falls to about 10KB/second when this is happening. The transmit traffic is about 20kb/sec. When a normal call takes place, both receive and transmit traffic are at about 20kb/sec.

Any thoughts?

2

I assume you mean kB, not kb, as, with the RTP overhead, there wouldn’t be enough capacity left for an acceptable codec.

I find it strange that Asterisk is still transmitting unless it is sending music on hold. Is the external party actually hearing music on hold?

Are you using native SIP transfers, or are you using FreePBX feature codes?

The asterisk log with the CLI command “rtp set debug on” having been issued would give a clearer indication of what is going on. Also, if this is a native SIP transfer, whether you are using the current (chan_pjsip) or deprecated channel driver and its protocol debugging output is likely to be important.

3

Yes I mean kB

Yes , external party is hearing music on hold

I am using the transfer buttons on the grandstream device



Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052286, ts 1645949085, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056353, ts 1234909655, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012208, ts 1234909648, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052287, ts 1645949245, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056354, ts 1234909815, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012209, ts 1234909808, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052288, ts 1645949405, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052289, ts 1645949565, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056355, ts 1234909975, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012210, ts 1234909968, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052290, ts 1645949725, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056356, ts 1234910135, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012211, ts 1234910128, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056357, ts 1234910295, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012212, ts 1234910288, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052291, ts 1645949885, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052292, ts 1645950045, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056358, ts 1234910455, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012213, ts 1234910448, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056359, ts 1234910615, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012214, ts 1234910608, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052293, ts 1645950205, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056360, ts 1234910775, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012215, ts 1234910768, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052294, ts 1645950365, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056361, ts 1234910935, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012216, ts 1234910928, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052295, ts 1645950525, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056362, ts 1234911095, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012217, ts 1234911088, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052296, ts 1645950685, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052297, ts 1645950845, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056363, ts 1234911255, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012218, ts 1234911248, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056364, ts 1234911415, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012219, ts 1234911408, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052298, ts 1645951005, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052299, ts 1645951165, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056365, ts 1234911575, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012220, ts 1234911568, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052300, ts 1645951325, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056366, ts 1234911735, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012221, ts 1234911728, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056367, ts 1234911895, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012222, ts 1234911888, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052301, ts 1645951485, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056368, ts 1234912055, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012223, ts 1234912048, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052302, ts 1645951645, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052303, ts 1645951805, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056369, ts 1234912215, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012224, ts 1234912208, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056370, ts 1234912375, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012225, ts 1234912368, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052304, ts 1645951965, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056371, ts 1234912535, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012226, ts 1234912528, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052305, ts 1645952125, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056372, ts 1234912695, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012227, ts 1234912688, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052306, ts 1645952285, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056373, ts 1234912855, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012228, ts 1234912848, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052307, ts 1645952445, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052308, ts 1645952605, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056374, ts 1234913015, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012229, ts 1234913008, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056375, ts 1234913175, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012230, ts 1234913168, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052309, ts 1645952765, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052310, ts 1645952925, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056376, ts 1234913335, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012231, ts 1234913328, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056377, ts 1234913495, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012232, ts 1234913488, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052311, ts 1645953085, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056378, ts 1234913655, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012233, ts 1234913648, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052312, ts 1645953245, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052313, ts 1645953405, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056379, ts 1234913815, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012234, ts 1234913808, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056380, ts 1234913975, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012235, ts 1234913968, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052314, ts 1645953565, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056381, ts 1234914135, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012236, ts 1234914128, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052315, ts 1645953725, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056382, ts 1234914295, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012237, ts 1234914288, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052316, ts 1645953885, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052317, ts 1645954045, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056383, ts 1234914455, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012238, ts 1234914448, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052318, ts 1645954205, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056384, ts 1234914615, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012239, ts 1234914608, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056385, ts 1234914775, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012240, ts 1234914768, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052319, ts 1645954365, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056386, ts 1234914935, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012241, ts 1234914928, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052320, ts 1645954525, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056387, ts 1234915095, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012242, ts 1234915088, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052321, ts 1645954685, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056388, ts 1234915255, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012243, ts 1234915248, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052322, ts 1645954845, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056389, ts 1234915415, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012244, ts 1234915408, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052323, ts 1645955005, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056390, ts 1234915575, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012245, ts 1234915568, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052324, ts 1645955165, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056391, ts 1234915735, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012246, ts 1234915728, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052325, ts 1645955325, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056392, ts 1234915895, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012247, ts 1234915888, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052326, ts 1645955485, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056393, ts 1234916055, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012248, ts 1234916048, len 000160)
Got  RTP packet from    192.168.22.134:5190 (type 08, seq 052327, ts 1645955645, len 000160)
Got  RTP packet from    192.168.22.133:5014 (type 00, seq 056394, ts 1234916215, len 000160)
Sent RTP packet to      192.168.22.134:5190 (type 08, seq 012249, ts 1234916208, len 000160)
4

OK. It’s a native transfer where the transferee failed to come out of hold.

I think we are definitely going to need to know which channel driver, and have its protocol debugging, along with quite verbose general logging, see Providing Great Debug - Support Services - Documentation.

I think it might also be instructive to know who the transferor was talking to when the transfer was completed, and what happens if the Grandstream users puts their phone on hold and then takes it off hold (assuming that is possible).

5

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