[asterisk-ss7] Using LIBSS7 on a TDMoE environment

Shaun Ruffell sruffell at digium.com
Fri Feb 11 11:38:01 CST 2011

On 02/11/2011 04:13 AM, Kaloyan Kovachev wrote:
> On Fri, 11 Feb 2011 11:04:49 +0100, mosbah.abdelkader at gmail.com 
> wrote:
>> For the timer, the doc mentions that a DAHDI card must be used!!!! 
>> What to use for timer if there is no card? Or, the timer does not 
>> matter if no hardware is available?
> You may use dahdi_dummy on Ast1 to provide the timing and use the 
> same timing on Ast2 delivered via the TDMoE span and probably again 
> dahdi_dummy as a backup timing device

I'm not a TDMoE expert but I ran into an issue when using DAHDI 2.4.0 with
dynamic_local spans that would probably affect you if you want to use
dahdi_dummy to provide timing for TDMoE spans.

The quick summary is that if you want to use dahdi_dummy with dynamic 
spans, please:

1) Enable dahdi_dummy in drivers/dahdi/Kbuild
2) Comment out the MODULE_ALIAS("dahdi_dummy") in drivers/dahdi/dahdi_base.c
3) Undefine ENABLE_TASKLETS in drivers/dahdi/dahdi_dynamic.c

If you are going this route, hopefully this might save you some

Here are the above three steps expressed in a patch:
diff --git a/drivers/dahdi/Kbuild b/drivers/dahdi/Kbuild
index 3fe2e28..c4ad534 100644
--- a/drivers/dahdi/Kbuild
+++ b/drivers/dahdi/Kbuild
@@ -1,5 +1,5 @@
 obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI)                  += dahdi.o
-#obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_DUMMY)           += dahdi_dummy.o
+obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_DUMMY)            += dahdi_dummy.o
 obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_DYNAMIC)          += dahdi_dynamic.o
 obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_DYNAMIC_LOC)      += dahdi_dynamic_loc.o
 obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_DYNAMIC_ETH)      += dahdi_dynamic_eth.o
diff --git a/drivers/dahdi/dahdi-base.c b/drivers/dahdi/dahdi-base.c
index ffa2a59..37d8fca 100644
--- a/drivers/dahdi/dahdi-base.c
+++ b/drivers/dahdi/dahdi-base.c
@@ -8685,7 +8685,7 @@ MODULE_LICENSE("GPL v2");
 /* DAHDI now provides timing. If anybody wants dahdi_dummy it's probably
  * for that. So make dahdi provide it for now. This alias may be removed
  * in the future, and users are encouraged not to rely on it. */
+/* MODULE_ALIAS("dahdi_dummy"); */
 module_param(debug, int, 0644);
diff --git a/drivers/dahdi/dahdi_dynamic.c b/drivers/dahdi/dahdi_dynamic.c
index 31a6c30..db542d1 100644
--- a/drivers/dahdi/dahdi_dynamic.c
+++ b/drivers/dahdi/dahdi_dynamic.c
@@ -43,7 +43,7 @@
  * tasklets.

Shaun Ruffell
Digium, Inc. | Linux Kernel Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at: www.digium.com & www.asterisk.org

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