Index: chan_alsa.c
===================================================================
--- chan_alsa.c	(revision 219786)
+++ chan_alsa.c	(working copy)
@@ -268,12 +268,12 @@
 	alsa.icard = alsa_card_init(indevname, SND_PCM_STREAM_CAPTURE);
 	alsa.ocard = alsa_card_init(outdevname, SND_PCM_STREAM_PLAYBACK);
 
-	if (!alsa.icard || !alsa.ocard) {
+	if (!alsa.icard && !alsa.ocard) {
 		ast_log(LOG_ERROR, "Problem opening ALSA I/O devices\n");
 		return -1;
 	}
 
-	return readdev;
+	return 0;
 }
 
 static int alsa_digit(struct ast_channel *c, char digit, unsigned int duration)
@@ -326,8 +326,10 @@
 			ast_indicate(alsa.owner, AST_CONTROL_RINGING);
 		}
 	}
-	snd_pcm_prepare(alsa.icard);
-	snd_pcm_start(alsa.icard);
+    if (alsa.icard) {
+		snd_pcm_prepare(alsa.icard);
+		snd_pcm_start(alsa.icard);
+	}
 	ast_mutex_unlock(&alsalock);
 
 	return 0;
@@ -338,8 +340,10 @@
 	ast_mutex_lock(&alsalock);
 	ast_verbose(" << Console call has been answered >> \n");
 	ast_setstate(c, AST_STATE_UP);
-	snd_pcm_prepare(alsa.icard);
-	snd_pcm_start(alsa.icard);
+    if (alsa.icard) {
+		snd_pcm_prepare(alsa.icard);
+		snd_pcm_start(alsa.icard);
+    }
 	ast_mutex_unlock(&alsalock);
 
 	return 0;
@@ -353,7 +357,9 @@
 	ast_verbose(" << Hangup on console >> \n");
 	ast_module_unref(ast_module_info->self);
 	hookstate = 0;
-	snd_pcm_drop(alsa.icard);
+	if (alsa.icard) {
+		snd_pcm_drop(alsa.icard);
+    }
 	ast_mutex_unlock(&alsalock);
 
 	return 0;
@@ -375,7 +381,7 @@
 	if (f->datalen > sizeof(sizbuf) - sizpos) {
 		ast_log(LOG_WARNING, "Frame too large\n");
 		res = -1;
-	} else {
+	} else if (alsa.ocard) {
 		memcpy(sizbuf + sizpos, f->data.ptr, f->datalen);
 		len += f->datalen;
 		pos = 0;
@@ -436,50 +442,51 @@
 	f.delivery.tv_sec = 0;
 	f.delivery.tv_usec = 0;
 
-	state = snd_pcm_state(alsa.icard);
-	if ((state != SND_PCM_STATE_PREPARED) && (state != SND_PCM_STATE_RUNNING)) {
-		snd_pcm_prepare(alsa.icard);
-	}
-
-	buf = __buf + AST_FRIENDLY_OFFSET / 2;
-
-	r = snd_pcm_readi(alsa.icard, buf + readpos, left);
-	if (r == -EPIPE) {
+    if (alsa.icard) {
+    	state = snd_pcm_state(alsa.icard);
+    	if ((state != SND_PCM_STATE_PREPARED) && (state != SND_PCM_STATE_RUNNING)) {
+    		snd_pcm_prepare(alsa.icard);
+    	}
+    
+    	buf = __buf + AST_FRIENDLY_OFFSET / 2;
+    
+    	r = snd_pcm_readi(alsa.icard, buf + readpos, left);
+    	if (r == -EPIPE) {
 #if DEBUG
-		ast_log(LOG_ERROR, "XRUN read\n");
+    		ast_log(LOG_ERROR, "XRUN read\n");
 #endif
-		snd_pcm_prepare(alsa.icard);
-	} else if (r == -ESTRPIPE) {
-		ast_log(LOG_ERROR, "-ESTRPIPE\n");
-		snd_pcm_prepare(alsa.icard);
-	} else if (r < 0) {
-		ast_log(LOG_ERROR, "Read error: %s\n", snd_strerror(r));
-	} else if (r >= 0) {
-		off -= r;
-	}
-	/* Update positions */
-	readpos += r;
-	left -= r;
-
-	if (readpos >= FRAME_SIZE) {
-		/* A real frame */
-		readpos = 0;
-		left = FRAME_SIZE;
-		if (chan->_state != AST_STATE_UP) {
-			/* Don't transmit unless it's up */
-			ast_mutex_unlock(&alsalock);
-			return &f;
-		}
-		f.frametype = AST_FRAME_VOICE;
-		f.subclass = AST_FORMAT_SLINEAR;
-		f.samples = FRAME_SIZE;
-		f.datalen = FRAME_SIZE * 2;
-		f.data.ptr = buf;
-		f.offset = AST_FRIENDLY_OFFSET;
-		f.src = "Console";
-		f.mallocd = 0;
-
-	}
+    		snd_pcm_prepare(alsa.icard);
+    	} else if (r == -ESTRPIPE) {
+    		ast_log(LOG_ERROR, "-ESTRPIPE\n");
+    		snd_pcm_prepare(alsa.icard);
+    	} else if (r < 0) {
+    		ast_log(LOG_ERROR, "Read error: %s\n", snd_strerror(r));
+    	} else if (r >= 0) {
+    		off -= r;
+    	}
+    	/* Update positions */
+    	readpos += r;
+    	left -= r;
+    
+    	if (readpos >= FRAME_SIZE) {
+    		/* A real frame */
+    		readpos = 0;
+    		left = FRAME_SIZE;
+    		if (chan->_state != AST_STATE_UP) {
+    			/* Don't transmit unless it's up */
+    			ast_mutex_unlock(&alsalock);
+    			return &f;
+    		}
+    		f.frametype = AST_FRAME_VOICE;
+    		f.subclass = AST_FORMAT_SLINEAR;
+    		f.samples = FRAME_SIZE;
+    		f.datalen = FRAME_SIZE * 2;
+    		f.data.ptr = buf;
+    		f.offset = AST_FRIENDLY_OFFSET;
+    		f.src = "Console";
+    		f.mallocd = 0;
+    	}
+    }
 	ast_mutex_unlock(&alsalock);
 
 	return &f;
@@ -676,8 +683,10 @@
 		}
 	}
 
-	snd_pcm_prepare(alsa.icard);
-	snd_pcm_start(alsa.icard);
+	if (alsa.icard) {
+        snd_pcm_prepare(alsa.icard);
+		snd_pcm_start(alsa.icard);
+	}
 
 	ast_mutex_unlock(&alsalock);