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LittleJohn
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ssrc wrong format?
04. Apr 2024 at 09:18
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Hi,

I'm using PhonerLite64 v3.24. Invite message sent when making a call contains ssrc parameters in the SDP part. My calls are rejected by provider. I was told that it's due to incorrect format of ssrc.
Example (from PhonerLite debug):
a=ssrc:3102715358

According to RFC 5576, the ssrc format is:
a=ssrc:<ssrc-id> <attribute>
a=ssrc:<ssrc-id> <attribute>:<value>

My understanding is that the PhonerLite misses the <attribute> in the ssrc. Am I right? Is it possible to fix it?

Many thanks.
  
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Re: ssrc wrong format?
Reply #1 - 05. Apr 2024 at 10:05
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I uploaded a new beta version. Can you try if that solves your problem?
  
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LittleJohn
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Re: ssrc wrong format?
Reply #2 - 08. Apr 2024 at 14:45
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Hi,

it looks better now, but still not working. I think the problem is that the PhonerLite uses negative number as ssrc-id, see example:
a=ssrc:-1815085392 cname:test@x.x.x.x


but RFC says:
<ssrc-id> is the synchronization source (SSRC) ID of the source being described, interpreted as a 32-bit unsigned integer in network byte order and represented in decimal
ssrc-id = integer ; 0 .. 2**32 - 1


I've tried to manipulate the ssrc-id "manually" at my end and when I changed it to positive integer, my provider accepted the call.

Thanks

  
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Re: ssrc wrong format?
Reply #3 - 09. Apr 2024 at 07:56
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I updated the beta version again. Thanks for the hint.
  
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LittleJohn
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Re: ssrc wrong format?
Reply #4 - 09. Apr 2024 at 14:03
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Hi there,

yep, now it works, provider accepts my calls  Smiley

a=ssrc:1453884725 cname:test@x.x.x.x


Thanks for your effort.

Gabriel
  
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