[asterisk-dev] [Code Review] Correct the number of available call numbers in IAX2

[rmudgett]

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Systems compiled with LOW_MEMORY have similar problems with the 2048 callno value.  The way TRUNK_CALL_START is used in a bit test does not work on the 2048 callno value because the tested bit is not set.

The only reason I can find that IAX_MAX_CALLS needs to be a power of 2 is when defining TRUNK_CALL_START and the use of it in a bit test in make_trunk().  Changing make_trunk() to use a compare operator instead of a bit test should remove all requirements that IAX_MAX_CALLS be a power of two.  It should be recommended that IAX_MAX_CALLS be a power of two for ease of distinguishing normal/trunk calls in IAX traces but not required.

TRUNK_CALL_START should also have insulating parentheses around the definition to avoid unexpected operator precedence issues.


- rmudgett


On Jan. 26, 2013, 12:41 p.m., Sean Bright wrote:
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> (Updated Jan. 26, 2013, 12:41 p.m.)
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> Review request for Asterisk Developers.
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> Summary
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> While populating the list of available call numbers in IAX2 when LOW_MEMORY is not defined, we use every number between 2 and 32768 (inclusive).  32768 is a 16 bit number (a 1 followed by 15 0s).  According to the IAX2 RFC, call numbers are 15 bit values, making 32768 invalid.
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> This patch reduces the number of allocated call numbers by 1 so that the are all 15 bits.
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> I intend to commit this change to Asterisk versions 1.8, 11, and trunk.
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> I have another patch to replace the ao2_container usage for call number selection almost ready for RB as well.
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> Diffs
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>   /trunk/channels/chan_iax2.c 380158 
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> Diff: https://reviewboard.asterisk.org/r/2293/diff
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> Testing
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> Ran thousands of test calls (both trunked and non-trunked) between 3 Asterisk servers.
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> 
> Thanks,
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> Sean
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>

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