Unnamed

                if (ast_exists_extension(chan, chan->context, exten, 1, chan->cid.cid_num)) {                        ast_copy_string(chan->exten, exten, sizeof(chan->exten));                        if (p->dsp) ast_dsp_digitreset(p->dsp);                        res = ast_pbx_run(chan);                        if (res) {                                ast_log(LOG_WARNING, "PBX exited non-zero\n");                                res = tone_zone_play_tone(p->subs[index].zfd, ZT_TONE_CONGESTION);                        }                        return NULL;                } else {                        if (option_verbose > 2)                                ast_verbose(VERBOSE_PREFIX_2 "Unknown extension '%s' in context '%s' requested\n", exten, chan->context);                        sleep(2);                        res = tone_zone_play_tone(p->subs[index].zfd, ZT_TONE_INFO);                        if (res < 0)                                ast_log(LOG_WARNING, "Unable to start special tone on %d\n", p->channel);                        else                                sleep(1);                        res = ast_streamfile(chan, "ss-noservice", chan->language);                        if (res >= 0)                                ast_waitstream(chan, "");                        res = tone_zone_play_tone(p->subs[index].zfd, ZT_TONE_CONGESTION);                        ast_hangup(chan);                        return NULL;                }                break;