Thanks Daz,
this is the dialplan on the phone itself:
(*xxxxxxx|*xxxxxx|*xxxxx|*xxxx|*xxx|*xx*|*x|**xxxxx|**xxxx|**xxx|**xx|[3469]11|0|00|[2-9]xxxxxx|1xxx[2-9]xxxxxxS0|xxxxxxxxxxxx.)
I checked and is exactly the same on both phones (SPA504G and Cisco 8861) but on the 8861 doesn't work when...