[Blink] BLINK FOR WINDOWS - Problem when using the buttom ON HOLD in calls, with another softphone

Peliza Carlos carlos.peliza at telefonica.com
Mon Dec 10 14:56:20 CET 2012

Hello my name is Carlos and I'm trying to obtain my graduation as an engineer.doing my thesis, which is to test the interaction between
free softphones in calls against Eyebeam.

One of the tests to be performed, is a call from "Blink" to  Eyebeam.
Pressing the HOLD ON button on Blink, waiting a while and re-press the HOLD ON to continue the call.
In this test, I have observed:

The RFC 2543 is obsolete and there is not used by Blink.

According to RFC 3264  the procedure should be:

1) Who puts ON HOLD (Side A) sends an invite with "sendonly" attribute in SDP
1.a) If the media stream was the result of a prior "sendrecv", side B  responds "recvonly"
1.b) Side B send an "inactive" attribute after "sendonly" receive, if the media stream  was the result of a prior "recvonly"
2) To re-press "ON HOLD", the A side sends the attribute "sendrecv"  or empty  (due to sendrecv is the default value)
3)Conversation is restarted .

However, in my tests, BLINK sends recvonly instead of sendrecv, to resume the conversation therefore never occurs again.

Please tell me  you found if this problem in tests, and let me know your opinion.

Thank you and happy to help



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