FreeCalypso > hg > themwi-system-sw

annotate libutil/nanp_valid.c @ 124:7e04d28fae8b

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sip-in: default use-100rel to no BulkVS servers act badly when we send a reliable 180 Ringing response to an incoming call, even though they advertise 100rel support in the Supported header in the INVITE packet, and we probably won't be implementing 100rel for outbound because doing per-the-spec PRACK as a UAC is just too burdensome. Therefore, we need to consider 100rel extension as not-really-supported in themwi-system-sw.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 01 Oct 2022 15:54:50 -0800
parents b1c364729a93
children 81958b35f74d
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b1c364729a93 libutil: add NANP number validation function
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
b1c364729a93 libutil: add NANP number validation function
Mychaela Falconia <falcon@freecalypso.org>
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2 * Utility functions for NANP number validation.
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3 */
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4
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5 is_nanp_valid_prefix(s)
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6 char *s;
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7 {
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8 /* validate NPA part */
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Mychaela Falconia <falcon@freecalypso.org>
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9 if (s[0] < '2')
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10 return(0);
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11 if (s[1] == '1' && s[2] == '1')
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12 return(0);
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13 if (s[1] == '9')
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14 return(0);
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15 /* validate exchange part */
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16 if (s[3] < '2')
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17 return(0);
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18 if (s[4] == '1' && s[5] == '1')
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19 return(0);
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20 /* all checks passed */
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21 return(1);
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Mychaela Falconia <falcon@freecalypso.org>
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22 }