Sincere apologies. I was wrong.
Sending a call to multiple destinations (known as forking) is a single rule. Commas separate the destinations in a list. In this case the comma is not separating two rules. This means:
1. The curly braces are not necessary for a single rule. So either
ph,pp(680xxxxxx)
or
{ph,pp(680xxxxxx)}
is the correct form.
2 {ph},{pp(680xxxxxx)} would be interpreted as two rules. Rules are checked one at a time from left to right and only the first one to succeed is acted upon. {ph} has no conditionality and will always succeed. The call will be sent to the phone port only and the {pp(680xxxxxx)} won't even be examined.