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extern int q931_call_setcrv(struct pri *pri, q931_call *call, int crv, int callmode);
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extern int q931_setup(struct pri *pri, q931_call *c, struct pri_sr *req);
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void q931_dump(struct pri *ctrl, int tei, q931_h *h, int len, int txrx);
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void q931_destroycall(struct pri *pri, q931_call *c);